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data/en.wikipedia.org/wiki/Academic_Family_Tree-0.md

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+---
+title: "Academic Family Tree"
+chunk: 1/1
+source: "https://en.wikipedia.org/wiki/Academic_Family_Tree"
+category: "reference"
+tags: "science, encyclopedia"
+date_saved: "2026-05-05T03:10:16.822511+00:00"
+instance: "kb-cron"
+---
+
+The Academic Family Tree, which began as Neurotree, is an online database for academic genealogy, containing numerous "family trees" of academic disciplines. Neurotree was established in 2005 as a family tree of neuroscientists. Later that year Academic Family Tree incorporated Neurotree and family trees of other scholarly disciplines.
+Unlike a conventional genealogy or family tree, in which connections among individuals are from kinship (e.g., parents to children), connections in Academic Family Tree are from mentoring relationships, usually among people working in academic settings (e.g., doctoral supervisors to students).
+Academic Family Tree has been used as sources of information for the history and prospects of academic fields such as psychology, meteorology, organizational communication, and neuroscience. It has been used to address infometrics, to research issues of scientific methodology, and to examine mentor characteristics that predict mentee academic success.
+
+
+== Functioning and scope ==
+The founders of the initial trees, including Neurotree, populated them from published sources, such as ProQuest. Later, they set up discipline-specific family trees of Academic Family Tree to be volunteer-run; accuracy is maintained by a group of volunteer editors. Hierarchical connections between mentors ("parents") and mentees ("children") are defined as any meaningful mentoring relationship (research assistant, graduate student, postdoctoral fellow, or research scientist). Continuous records extend well into the Middle Ages and earlier.
+As of 29 September 2023, Academic Family Tree contained 871,361 people with 882,278 connections among them.
+Academic Family Tree encompasses a broad range of discipline-specific trees. As of 29 September 2023, there were 73 trees spanning science (e.g., human genetics, microbiology, and psychology), mathematics and philosophy, engineering, the humanities (e.g., economics, law, theology, and music), and business (e.g., organizational communication and advertising).
+All trees within Academic Family Tree are closely linked. A search for a person in one tree gives hits from all trees in Academic Family Tree.
+The data in Academic Family Tree are owned by the nonprofit academictree.org, but they are shared under the Creative Commons License (CC-BY 3.0). This means a person may use the data in any tree for any purpose as long as the source is cited.
+
+
+== Tools ==
+All trees under Academic Family Tree have a set of tools similar to those of conventional genealogy applications. One is Distance that allows a user to enter two scholars' names and to determine the number of degrees of separation between the two. For example, the number of degrees of academic separation between Isaac Newton and Marie Curie is 9 (including research assistantships, postdoctoral positions, and research scientist positions).
+
+
+== History ==
+Neurotree was founded in January 2005 by Stephen V. David, then an assistant professor in the Oregon Hearing Research Center of Oregon Health and Science University, and by Benjamin Y. Hayden, an assistant professor in the Department of Brain and Cognitive Sciences, Center for Visual Science, University of Rochester. David and Hayden founded Academic Family Tree soon after founding Neurotree.
+In November 2014, David received funding for Neurotree from the Metaknowledge Network. In November 2016, David received funding for Academic Family Tree from the National Science Foundation (NSF) SciSIP Program. In July 2019, David again received funding for Neurotree from the NSF.
+Marsh (2017) pointed out that information for Neurotree and Academic Family Tree is provided by volunteers and it is not formally peer-reviewed. She cautioned that this can mean their information is inaccurate.
+
+
+=== Relation to other academic genealogies ===
+One other notable discipline-specific academic genealogy is the Mathematics Genealogy Project. Academic Family Tree has its own mathematics tree, MathTree but it is much less complete than the Mathematics Genealogy Project. As of 29 September 2023, MathTree contained 35,817 people whereas the Mathematics Genealogy Project contained 297,268 people.
+One other general academic genealogy was PhD Tree. PhD Tree ceased functioning some time after June 2017.
+
+
+== See also ==
+Mathematics Genealogy Project
+
+
+== References ==
+
+
+== External links ==
+Academic Family Tree

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+---
+title: "Academic genealogy"
+chunk: 1/1
+source: "https://en.wikipedia.org/wiki/Academic_genealogy"
+category: "reference"
+tags: "science, encyclopedia"
+date_saved: "2026-05-05T03:10:18.077766+00:00"
+instance: "kb-cron"
+---
+
+An academic genealogy (or scientific genealogy) organizes a family tree of scientists and scholars according to mentoring relationships, often in the form of dissertation supervision relationships, and not according to genetic relationships as in conventional genealogy. Since the term academic genealogy has now developed this specific meaning, its additional use to describe a more academic approach to conventional genealogy would be ambiguous, so the description scholarly genealogy is now generally used in the latter context.
+
+
+== Overview ==
+The academic lineage or academic ancestry of someone is a chain of professors who have served as academic mentors or thesis advisors of each other, ending with the person in question. Many genealogical terms are often recast in terms of academic lineages, so one may speak of academic descendants, children,  siblings, etc. One method of developing an academic genealogy is to organize individuals by prioritizing their degree of relationship to a mentor/advisor as follows: (1). doctoral students, (2). post-doctoral researchers, (3). master's students and (4). current students, including undergraduate researchers.
+Through the 19th century, particularly for graduates in sciences such as chemistry, it was common to have completed a degree in medicine or pharmacy before continuing with post-graduate or post-doctoral studies. Until the early 20th century, attaining professorial status or mentoring graduate students did not necessarily require a doctorate or graduate degree. For instance, the University of Cambridge did not require a formal doctoral thesis until 1919, and academic genealogies that include earlier Cambridge students tend to substitute an equivalent mentor. Academic genealogies are particularly easy to research in the case of Spain's doctoral degrees, because until 1954 only Complutense University had the power to grant doctorates. This means that all holders of a doctorates in Spain can trace back their academic lineage to a doctoral supervisor who was a member of Complutense's Faculty.
+Websites such as the Mathematics Genealogy Project or the Chemical Genealogy document academic lineages for specific subject areas, while some other sites, such as Neurotree and Academic Family Tree aim to provide a complete academic genealogy across all fields of academia.
+
+
+== Influence ==
+Academic genealogy may influence research results in areas of active research.  Hirshman et al. examined a controversial medical question, the value of maximal surgery for high grade glioma, and demonstrated that a physician's medical academic genealogy can affect his or her findings and approaches to treatment.
+
+
+== References ==
+
+
+== External links ==
+The Academic Family Tree: A project combining academic genealogies of 38 (as of August 2015) academic disciplines
+Neurotree: The neuroscience family tree
+Linguistree: The linguistics family tree
+Mathematics genealogy search (includes much of computer science and physics)
+The Astronomy Genealogy Project
+Chemical genealogy
+Scientific genealogy master list (two sections: Scientists Associated with Concepts in Chemistry & Physics; Scientists Associated with Discovering the Elements)
+How to trace your scientific genealogy
+Philosophy Family Tree
+Automatic doctoral advisor genealogy diagram using Wikipedia by Nghia Ho

data/en.wikipedia.org/wiki/Aether_(classical_element)-0.md

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+---
+title: "Aether (classical element)"
+chunk: 1/2
+source: "https://en.wikipedia.org/wiki/Aether_(classical_element)"
+category: "reference"
+tags: "science, encyclopedia"
+date_saved: "2026-05-05T03:10:19.204985+00:00"
+instance: "kb-cron"
+---
+
+According to ancient and medieval science, aether (, alternative spellings include æther, aither, and ether), also known as the fifth element or quintessence, is the material that fills the region of the universe beyond the terrestrial sphere. The concept of aether was used in several theories to explain several natural phenomena, such as the propagation of light and gravity. In the late 19th century, physicists postulated that aether permeated space, providing a medium through which light could travel in a vacuum, but evidence for the presence of such a medium was not found in the Michelson–Morley experiment, and this result has been interpreted to mean that no luminiferous aether exists.
+
+== Mythological origins ==
+
+The word αἰθήρ (aithḗr) in Homeric Greek means "pure, fresh air" or "clear sky". In Greek mythology, it was thought to be the pure essence that the gods breathed, filling the space where they lived, analogous to the air breathed by mortals. It is also personified as a deity, Aether, the son of Erebus and Nyx in traditional Greek mythology. Aether is related to αἴθω "to incinerate", and intransitive "to burn, to shine" (related is the name Aithiopes (Ethiopians; see Aethiopia), meaning "people with a burnt (black) visage").
+
+== Fifth element ==
+
+In Plato's Timaeus (58d) speaking about air, Plato mentions that "there is the most translucent kind which is called by the name of aether (αἰθήρ)" but otherwise he adopted the classical system of four elements. Aristotle, who had been Plato's student at the Academy, agreed on this point with his former mentor, emphasizing additionally that fire has sometimes been mistaken for aether. However, in his Book On the Heavens he introduced a new "first" element to the system of the classical elements of Ionian philosophy. He noted that the four terrestrial classical elements were subject to change and naturally moved linearly. The first element however, located in the celestial regions and heavenly bodies, moved circularly and had none of the qualities the terrestrial classical elements had. It was neither hot nor cold, neither wet nor dry. With this addition the system of elements was extended to five and later commentators started referring to the new first one as the fifth and also called it aether, a word that Aristotle had used in On the Heavens and the Meteorology.
+Aether differed from the four terrestrial elements; it was incapable of motion of quality or motion of quantity. Aether was only capable of local motion. Aether naturally moved in circles, and had no contrary, or unnatural, motion. Aristotle also stated that celestial spheres made of aether held the stars and planets. The idea of aethereal spheres moving with natural circular motion led to Aristotle's explanation of the observed orbits of stars and planets in perfectly circular motion.
+Medieval scholastic philosophers granted aether changes of density, in which the bodies of the planets were considered to be more dense than the medium which filled the rest of the universe. Robert Fludd stated that the aether was "subtler than light". Fludd cites the 3rd-century view of Plotinus, concerning the aether as penetrative and non-material.
+
+== Quintessence ==
+
+Quintessence (𝓠) is the Latinate name of the fifth element used by medieval alchemists for a medium similar or identical to that thought to make up the heavenly bodies. It was noted that there was very little presence of quintessence within the terrestrial sphere. Due to the low presence of quintessence, earth could be affected by what takes place within the heavenly bodies. This theory was developed in the 14th century text The testament of Lullius, attributed to Ramon Llull. The use of quintessence became popular within medieval alchemy. Quintessence stemmed from the medieval elemental system, which consisted of the four classical elements, and aether, or quintessence, in addition to two chemical elements representing metals: sulphur, "the stone which burns", which characterized the principle of combustibility, and mercury, which contained the idealized principle of metallic properties.
+This elemental system spread rapidly throughout all of Europe and became popular with alchemists, especially in medicinal alchemy. Medicinal alchemy then sought to isolate quintessence and incorporate it within medicine and elixirs. Due to quintessence's pure and heavenly quality, it was thought that through consumption one may rid oneself of any impurities or illnesses. In The book of Quintessence, a 15th-century English translation of a continental text, quintessence was used as a medicine for many of man's illnesses. A process given for the creation of quintessence is distillation of alcohol seven times. Over the years, the term quintessence has become synonymous with elixirs, medicinal alchemy, and the philosopher's stone itself.
+
+== Legacy ==
+
+With the 18th century physics developments, physical models known as "aether theories" made use of a similar concept for the explanation of the propagation of electromagnetic and gravitational forces. As early as the 1670s, Newton used the idea of aether to help match observations to strict mechanical rules of his physics. The early modern aether had little in common with the aether of classical elements from which the name was borrowed. These aether theories are considered to be scientifically obsolete, as the development of special relativity showed that Maxwell's equations do not require the aether for the transmission of these forces. Einstein noted that his own model which replaced these theories could itself be thought of as an aether, as it implied that the empty space between objects had its own physical properties.
+Despite the early modern aether models being superseded by general relativity, occasionally some physicists have attempted to reintroduce the concept of aether in an attempt to address perceived deficiencies in current physical models. One proposed model of dark energy has been named "quintessence" by its proponents, in honor of the classical element. This idea relates to the hypothetical form of dark energy postulated as an explanation of observations of an accelerating universe. It has also been called a fifth fundamental force.
+
+=== Aether and light ===

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+---
+title: "Aether (classical element)"
+chunk: 2/2
+source: "https://en.wikipedia.org/wiki/Aether_(classical_element)"
+category: "reference"
+tags: "science, encyclopedia"
+date_saved: "2026-05-05T03:10:19.204985+00:00"
+instance: "kb-cron"
+---
+
+The motion of light was a long-standing investigation in physics for hundreds of years before the 20th century. The use of aether to describe this motion was popular during the 17th and 18th centuries, including a theory proposed by Johann II Bernoulli, who was recognized in 1736 with the prize of the French Academy. In his theory, all space is permeated by aether containing "excessively small whirlpools". These whirlpools allow for aether to have a certain elasticity, transmitting vibrations from the corpuscular packets of light as they travel through.
+This theory of luminiferous aether would influence the wave theory of light proposed by Christiaan Huygens, in which light traveled in the form of longitudinal waves via an "omnipresent, perfectly elastic medium having zero density, called aether". At the time, it was thought that in order for light to travel through a vacuum, there must have been a medium filling the void through which it could propagate, as sound through air or ripples in a pool. Later, when it was proved that the nature of light wave is transverse instead of longitudinal, Huygens' theory was replaced by subsequent theories proposed by Maxwell, Einstein and de Broglie, which rejected the existence and necessity of aether to explain the various optical phenomena. These theories were supported by the results of the Michelson–Morley experiment in which evidence for the motion of aether was conclusively absent. The results of the experiment influenced many physicists of the time and contributed to the eventual development of Einstein's theory of special relativity.
+
+=== Aether and gravitation ===
+
+In 1682, Jakob Bernoulli formulated the theory that the hardness of the bodies depended on the pressure of the aether.
+Aether has been used in various gravitational theories as a medium to help explain gravitation and what causes it.
+
+A few years later, aether was used in one of Sir Isaac Newton's first published theories of gravitation, Philosophiæ Naturalis Principia Mathematica (the Principia, 1687). He based the whole description of planetary motions on a theoretical law of dynamic interactions. He renounced standing attempts at accounting for this particular form of interaction between distant bodies by introducing a mechanism of propagation through an intervening medium. He calls this intervening medium aether. In his aether model, Newton describes aether as a medium that "flows" continually downward toward the Earth's surface and is partially absorbed and partially diffused. This "circulation" of aether is what he associated the force of gravity with to help explain the action of gravity in a non-mechanical fashion. This theory described different aether densities, creating an aether density gradient. His theory also proposed that aether is rarified within objects and dense outside them. As particles of denser aether interact with the rare aether they are attracted back to the dense aether much like cooling vapors of water are attracted back to each other to form water. In the Principia he attempts to explain the elasticity and movement of aether by relating aether to his static model of fluids. This elastic interaction is what caused the pull of gravity to take place, according to this early theory, allowing gravity to be explained in terms of action through direct contact instead of action at a distance, which Newton considered "an absurdity". Newton also explained this changing rarity and density of aether in his letter to Robert Boyle in 1679. He illustrated aether and its field around objects in this letter as well and used this as a way to inform Robert Boyle about his theory. Although Newton eventually changed his theory of gravitation to one involving force and the laws of motion, his starting point for the modern understanding and explanation of gravity came from his original aether model on gravitation.
+
+== See also ==
+
+== References ==
+Footnotes
+
+Citations

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+---
+title: "Alchemy"
+chunk: 1/12
+source: "https://en.wikipedia.org/wiki/Alchemy"
+category: "reference"
+tags: "science, encyclopedia"
+date_saved: "2026-05-05T03:10:20.410298+00:00"
+instance: "kb-cron"
+---
+
+Alchemy (from the Arabic word al-kīmīā, الكیمیاء) is an ancient branch of natural philosophy, a philosophical and protoscientific tradition that was historically practised in China, India, the Muslim world, and Europe. In its Western form, alchemy is first attested in a number of pseudepigraphical texts written in Greco-Roman Egypt during the first few centuries AD. Greek-speaking alchemists often referred to their craft as "the Art" (τέχνη) or "Knowledge" (ἐπιστήμη), and it was often characterised as mystic (μυστική), sacred (ἱɛρά), or divine (θɛíα).
+Alchemists attempted to purify, mature, and perfect certain materials. Common aims were chrysopoeia, the transmutation of "base metals" (e.g., lead) into "noble metals" (particularly gold); the creation of an elixir of immortality; and the creation of panaceas able to cure any disease. The perfection of the human body and soul was thought to result from the alchemical magnum opus ("Great Work"). The concept of creating the philosopher's stone was variously connected with all of these projects.
+Islamic and European alchemists developed a basic set of laboratory techniques, theories, and terms, some of which are still in use today. They did not abandon the Ancient Greek philosophical idea that everything is composed of four elements, and they tended to guard their work in secrecy, often making use of cyphers and cryptic symbolism. In Europe, the 12th-century translations of medieval Islamic works on science and the rediscovery of Aristotelian philosophy gave birth to a flourishing tradition of Latin alchemy. This late medieval tradition of alchemy would go on to play a significant role in the development of early modern science (particularly chemistry and medicine).
+Modern discussions of alchemy are generally split into an examination of its exoteric practical applications and its esoteric spiritual aspects, despite criticisms by scholars such as Eric J. Holmyard and Marie-Louise von Franz that they should be understood as complementary. The former is pursued by historians of the physical sciences, who examine the subject in terms of early chemistry, medicine, and charlatanism, and the philosophical and religious contexts in which these events occurred. The latter interests historians of esotericism, psychologists, and some philosophers and spiritualists. The subject has also made an ongoing impact on literature and the arts.
+
+== Etymology ==
+
+The word alchemy comes from Old French alkimie, used in Medieval Latin as alchymia. This name was itself adopted from the Arabic word al-kīmiyā (الكيمياء). The Arabic al-kīmiyā in turn was a borrowing of the Late Greek term khēmeía (χημεία), also spelled khumeia (χυμεία) and khēmía (χημία), with al- being the Arabic definite article 'the'. Together this association can be interpreted as 'the process of transmutation by which to fuse or reunite with the divine or original form'. Several etymologies have been proposed for the Greek term. The first was proposed by Zosimos of Panopolis (3rd–4th centuries), who derived it from the name of a book, the Khemeu. Hermann Diels argued in 1914 that it rather derived from χύμα, used to describe metallic objects formed by casting.
+Others trace its roots to the Egyptian name kēme, meaning 'black earth', which refers to the fertile and auriferous soil of the Nile valley, as opposed to red desert sand. According to the Egyptologist Wallis Budge, the Arabic word al-kīmiyaʾ actually means "the Egyptian [science]", borrowing from the Coptic word for "Egypt", kēme (or its equivalent in the Mediaeval Bohairic dialect of Coptic, khēme). This Coptic word derives from Demotic kmỉ, itself from ancient Egyptian kmt. The ancient Egyptian word referred to both the country and the colour "black" (Egypt was the "black Land", by contrast with the "red Land", the surrounding desert).
+
+== History ==
+Alchemy encompasses several philosophical traditions spanning some four millennia and three continents. These traditions' general penchant for cryptic and symbolic language makes it hard to trace their mutual influences and genetic relationships. Three major strands exist which appear to be mostly independent, at least in their earlier stages: Chinese alchemy, centered in China; Indian alchemy (Rasayana), centered on the Indian subcontinent; and Western alchemy, which occurred around the Mediterranean Basin and whose center shifted over the millennia from Greco-Roman Egypt to the Muslim world, and finally medieval Europe. Chinese alchemy was closely connected to Taoism and Indian alchemy with the Dharmic faiths. In contrast, Western alchemy developed its philosophical system mostly independent of but influenced by various Western religions. It is still an open question whether these three strands share a common origin, or to what extent they influenced each other.
+
+=== Hellenistic Egypt ===

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+---
+title: "Alchemy"
+chunk: 2/12
+source: "https://en.wikipedia.org/wiki/Alchemy"
+category: "reference"
+tags: "science, encyclopedia"
+date_saved: "2026-05-05T03:10:20.410298+00:00"
+instance: "kb-cron"
+---
+
+The start of Western alchemy may generally be traced to Hellenistic Egypt, where the city of Alexandria was a center of alchemical knowledge, and retained its pre-eminence through most of the Greek and Roman periods. Following the work of André-Jean Festugière, modern scholars see alchemical practice in the Roman Empire as originating from the Egyptian goldsmith's art, Greek philosophy and different religious traditions. Tracing the origins of the alchemical art in Egypt is complicated by the pseudepigraphic nature of texts from the Greek alchemical corpus. The treatises of Zosimos of Panopolis, the earliest historically attested author (fl. c. 300), can help in situating the other authors. Zosimus based his work on that of older alchemical authors, such as Mary the Jewess, Pseudo-Democritus, and Agathodaimon, but very little is known about any of these authors. The most complete of their works, the Four Books of Pseudo-Democritus, were probably written in the first century AD.
+Recent scholarship tends to emphasize the testimony of Zosimus, who traced the alchemical arts back to Egyptian metallurgical and ceremonial practices. It has also been argued that early alchemical writers borrowed the vocabulary of Greek philosophical schools but did not implement any of its doctrines in a systematic way. Zosimos of Panopolis wrote in the Final Abstinence (a.k.a. the Final Count) that the ancient practice of "tinctures" (the technical Greek term for the alchemical arts) had been taken over by certain "demons" who taught the art only to those who offered them sacrifices. Since Zosimos also called the demons "the guardians of places" (οἱ κατὰ τόπον ἔφοροι, hoi katà tópon éphoroi) and those who offered them sacrifices "priests" (ἱερέα, hieréa), it is fairly clear that he was referring to the gods of Egypt and their priests. While critical of the kind of alchemy he associated with the Egyptian priests and their followers, Zosimos nonetheless saw the tradition's recent past as rooted in the rites of the Egyptian temples.
+
+==== Mythology ====
+Zosimos of Panopolis asserted that alchemy dated back to Pharaonic Egypt where it was the domain of the priestly class, though there is little to no evidence for his assertion. Alchemical writers used classical figures from Greek (e.g., Hades), Roman (e.g., Lucius), and Egyptian mythology to illuminate their works and allegorize alchemical transmutation. These included the pantheon of gods related to the classical planets, Isis, Osiris, Jason, and many others.
+The central figure in the mythology of alchemy is Hermes Trismegistus (Ἑρμῆς ὁ Τρισμέγιστος, 'Hermes the Thrice-Greatest'). His name is derived from the god Thoth and his Greek counterpart, Hermes. Hermes and his caduceus or serpent-staff, were among alchemy's principal symbols. According to Clement of Alexandria, he wrote what were called the "forty-two books of Hermes", covering all fields of knowledge.
+
+==== Hermetica and Emerald Tablet ====
+
+The Hermetica are a compendium of texts attributed to Hermes Trismegistus. Many of them have close historical connections with Western alchemical philosophy and practice (which was sometimes called the Hermetic philosophy by its practitioners). By modern convention, the Hermetica is usually subdivided into two main categories: the "technical" and "religio-philosophical" Hermetica. The "technical" Hermetica deals with alchemy, astrology, medicine, pharmacology, and magic. Its oldest parts were written in Greek and may go back as far as the second or third century BC.
+Many of the texts in the "technical" Hermetica were later translated, first into Arabic and then into Latin, often being extensively revised and expanded throughout the centuries. Some of them were also originally written in Arabic. In other cases their status as an original work or translation remains unclear. These Arabic and Latin Hermetic texts were widely copied throughout the Middle Ages. The most famous of these texts is the Emerald Tablet, also known as the Smaragdine Table or the Tabula Smaragdina, a compact and cryptic text. The earliest known versions of it are four Arabic recensions preserved in mystical and alchemical treatises between the 8th and 10th centuries AD—chiefly the Secret of Creation (سر الخليقة, Sirr al-Khalīqa) and the Secret of Secrets (سرّ الأسرار, Sirr al-Asrār). From the 12th century onward, Latin translations—most notably, the widespread so-called Vulgate (not to be confused with the late-fourth-century Latin translation of the Tanakh and Christian New Testament known as the Vulgate)—introduced the Emerald Tablet to Europe, where it attracted great scholarly interest. Medieval commentators such as Ortolanus interpreted it as a "foundational text" of alchemical instructions for producing the philosopher's stone and making gold.
+
+==== Technology ====
+The dawn of Western alchemy is sometimes associated with that of metallurgy, extending back to 3500 BC. Many writings were lost when the Roman emperor Diocletian ordered the burning of alchemical books after suppressing a revolt in Alexandria (AD 292). Few original Egyptian documents on alchemy have survived, most notable among them the Stockholm papyrus and the Leyden papyrus X. Dating from AD 250 to 300, they contained recipes for dyeing and making artificial gemstones, cleaning and fabricating pearls, and manufacturing of imitation gold and silver. These writings lack the mystical, philosophical elements of alchemy, but do contain the works of Bolus of Mendes (or Pseudo-Democritus), which aligned these recipes with theoretical knowledge of astrology and the classical elements. Between the time of Bolus and Zosimos, the change took place that transformed this metallurgy into a Hermetic art.
+
+==== Philosophy ====
+Alexandria acted as a melting pot for philosophies of Pythagoreanism, Platonism, Stoicism, and Gnosticism that formed the origin of alchemy's character. An important example of alchemy's roots in Greek philosophy, originated by Empedocles and developed by Aristotle, was that all things in the universe were formed from only four elements: earth, air, water, and fire. According to Aristotle, each element had a sphere to which it belonged and to which it would return if left undisturbed. The four elements of the Greek were mostly qualitative aspects of matter rather than the modern quantitative elements' natures, according to Titus Burckhardt: 

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+---
+title: "Alchemy"
+chunk: 11/12
+source: "https://en.wikipedia.org/wiki/Alchemy"
+category: "reference"
+tags: "science, encyclopedia"
+date_saved: "2026-05-05T03:10:20.410298+00:00"
+instance: "kb-cron"
+---
+
+Alchemy has had a long-standing relationship with art, evident in both alchemical texts and mainstream entertainment. Literary alchemy appears throughout the history of English literature from William Shakespeare to J. K. Rowling, and also the popular Japanese manga Fullmetal Alchemist. Here, characters or plot structure follow an alchemical magnum opus. In the 14th century, Chaucer began a trend of alchemical satire that can still be seen in recent fantasy works, such as those of the late Sir Terry Pratchett. Another literary work inspired by the alchemical tradition is the 1988 novel The Alchemist by Brazilian writer Paulo Coelho.
+Visual artists have had a similar relationship with alchemy. While some used it as a source of satire, others worked with the alchemists themselves or integrated alchemical thought or symbols in their work. Music was also present in the works of alchemists and continues to influence popular performers. In the last hundred years, alchemists have been portrayed in a magical and spagyric role in fantasy fiction, film, television, novels, comics, and video games.
+
+=== Science ===
+
+One goal of alchemy, the transmutation of base substances into gold, is now known to be impossible by means of traditional chemistry, but possible by other physical means. Although not financially worthwhile, gold was synthesized in particle accelerators as early as 1941.
+
+== See also ==
+
+== Notes ==
+
+== References ==
+
+=== Citations ===
+
+=== Sources used ===
+
+== Bibliography ==
+
+=== Introductions and textbooks ===
+Beretta, Marco, ed. (2022). A Cultural History Of Chemistry in Antiquity. London: Bloomsbury. doi:10.5040/9781474203746. ISBN 978-1-4742-9453-9. (focus on technical aspects)
+Burnett, Charles; Moureau, Sébastien, eds. (2022). A Cultural History Of Chemistry in the Middle Ages. London: Bloomsbury. ISBN 978-1-4742-9454-6. (focus on technical aspects)
+Halleux, Robert (1979). Les textes alchimiques. Turnhout: Brepols. ISBN 978-2-503-36032-4.
+Joly, Bernard (2013). Histoire de l'alchimie. Paris: Vuibert-Adapt. ISBN 978-2-311-01248-4. (general overview)
+Martelli, Matteo (2019). L'alchimista antico: Dall'Egitto greco-romano a Bisanzio. Milano: Editrice Bibliografica. ISBN 978-88-7075-979-2. (Greek and Byzantine alchemy)
+Moran, Bruce, ed. (2022). A Cultural History Of Chemistry in the Early Modern Age. London: Bloomsbury. ISBN 978-1-4742-9459-1. (focus on technical aspects)
+Multhauf, Robert P. (1966). The Origins of Chemistry. London: Oldbourne. OCLC 977570829.
+Nicolaïdis, Efthymios, ed. (2018). Greek Alchemy from Late Antiquity to Early Modernity. De Diversis Artibus. Vol. 104. Turnhout: Brepols. doi:10.1484/M.DDA-EB.5.116173. ISBN 978-2-503-58191-0. (Greek and Byzantine alchemy)
+Partington, James R. (1970) [1961]. A History of Chemistry. Volume 1, Part I. London: Macmillan. ISBN 978-0-333-03490-3. (the second part of volume 1 was never published; the other volumes deal with the modern period and are not relevant for alchemy)
+Pereira, Michela (2001). Arcana Sapienza: Storia dell'alchimia occidentale dalle origini a Jung. Rome: Carocci. ISBN 978-88-430-9647-3. (general overview, focus on esoteric aspects)
+Principe, Lawrence M. (2013). The Secrets of Alchemy. University of Chicago Press. ISBN 978-0-226-68295-2. (general overview, written in a highly accessible style)
+Rampling, Jennifer M. (2020). The Experimental Fire: Inventing English Alchemy, 1300–1700. Chicago: University of Chicago Press. ISBN 978-0-226-82654-7.
+Viano, Cristina, ed. (2005). L'alchimie et ses racines philosophiques. La tradition grecque et la tradition arabe. Paris: Vrin. ISBN 978-2-7116-1754-8.
+
+=== Greco-Egyptian alchemy ===
+
+==== Texts ====
+Marcellin Berthelot and Charles-Émile Ruelle (eds.), Collection des anciens alchimistes grecs (CAAG), 3 vols., 1887–1888, Vol 1: https://gallica.bnf.fr/ark:/12148/bpt6k96492923, Vol 2: https://gallica.bnf.fr/ark:/12148/bpt6k9680734p, Vol. 3: https://gallica.bnf.fr/ark:/12148/bpt6k9634942s.
+André-Jean Festugière, La Révélation d'Hermès Trismégiste, Paris, Les Belles Lettres, 2014 (ISBN 978-2-251-32674-0, OCLC 897235256).
+Robert Halleux and Henri-Dominique Saffrey (eds.), Les alchimistes grecs, t. 1 : Papyrus de Leyde – Papyrus de Stockholm – Recettes, Paris, Les Belles Lettres, 1981.
+Otto Lagercrantz (ed), Papyrus Graecus Holmiensis, Uppsala, A.B. Akademiska Bokhandeln, 1913, Papyrus graecus holmiensis (P. holm.); Recepte für Silber, Steine und Purpur, bearb. von Otto Lagercrantz. Hrsg. mit Unterstützung des Vilh. Ekman'schen Universitätsfonds.
+Michèle Mertens and Henri-Dominique Saffrey (ed.), Les alchimistes grecs, t. 4.1 : Zosime de Panopolis. Mémoires authentiques, Paris, Les Belles Lettres, 1995.
+Andrée Collinet and Henri-Dominique Saffrey (ed.), Les alchimistes grecs, t. 10 : L'Anonyme de Zuretti ou l'Art sacré and divin de la chrysopée par un anonyme, Paris, Les Belles Lettres, 2000.
+Andrée Collinet (ed), Les alchimistes grecs, t. 11 : Recettes alchimiques (Par. Gr. 2419; Holkhamicus 109) – Cosmas le Hiéromoine – Chrysopée, Paris, Les Belles Lettres, 2000.
+Matteo Martelli (ed), The Four Books of Pseudo-Democritus, Maney Publishing, 2014.

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+title: "Alchemy"
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+---
+
+==== Studies ====
+Dylan M. Burns, " μίξεώς τινι τέχνῃ κρείττονι : Alchemical Metaphor in the Paraphrase of Shem (NHC VII,1) ", Aries 15 (2015), p. 79–106.
+Alberto Camplani, " Procedimenti magico-alchemici e discorso filosofico ermetico " in Giuliana Lanata (ed.), Il Tardoantico alle soglie del Duemila, ETS, 2000, p. 73–98.
+Alberto Camplani and Marco Zambon, " Il sacrificio come problema in alcune correnti filosofice di età imperiale ", Annali di storia dell'esegesi 19 (2002), p. 59–99.
+Régine Charron and Louis Painchaud, " 'God is a Dyer,' The Background and Significance of a Puzzling Motif in the Coptic Gospel According to Philip (CG II, 3), Le Muséon 114 (2001), p. 41-50.
+Régine Charron, " The Apocryphon of John (NHC II,1) and the Greco-Egyptian Alchemical Literature ", Vigiliae Christinae 59 (2005), p. 438-456.
+Philippe Derchain, "L'Atelier des Orfèvres à Dendara et les origines de l'alchimie," Chronique d'Égypte, vol. 65, no 130, 1990, p. 219–242.
+Korshi Dosoo, " A History of the Theban Magical Library ", Bulletin of the American Society of Papyrologists 53 (2016), p. 251–274.
+Olivier Dufault, Early Greek Alchemy, Patronage and Innovation in Late Antiquity, California Classical Studies, 2019, Early Greek Alchemy, Patronage and Innovation in Late Antiquity.
+Sergio Knipe, " Sacrifice and self-transformation in the alchemical writings of Zosimus of Panopolis ", in Christopher Kelly, Richard Flower, Michael Stuart Williams (eds.), Unclassical Traditions. Volume II: Perspectives from East and West in Late Antiquity, Cambridge University Press, 2011, p. 59–69.
+André-Jean Festugière, La Révélation d'Hermès Trismégiste, Paris, Les Belles Lettres, 2014 ISBN 978-2-251-32674-0, OCLC 897235256.
+Kyle A. Fraser, " Zosimos of Panopolis and the Book of Enoch: Alchemy as Forbidden Knowledge ", Aries 4.2 (2004), p. 125–147.
+Kyle A. Fraser, " Baptized in Gnosis: The Spiritual Alchemy of Zosimos of Panopolis ", Dionysius 25 (2007), p. 33–54.
+Kyle A. Fraser, " Distilling Nature's Secrets: The Sacred Art of Alchemy ", in John Scarborough and Paul Keyser (eds.), Oxford Handbook of Science and Medicine in the Classical World, Oxford University Press, 2018, p. 721–742. 2018. [1].
+Shannon Grimes, Becoming Gold: Zosimos of Panopolis and the Alchemical Arts in Roman Egypt, Auckland, Rubedo Press, 2018, ISBN 978-0-473-40775-9
+Paul T. Keyser, " Greco-Roman Alchemy and Coins of Imitation Silver ", American Journal of Numismatics 7–8 (1995–1996), p. 209–234.
+Paul Keyser, " The Longue Durée of Alchemy ", in John Scarborough and Paul Keyser (eds.), Oxford Handbook of Science and Medicine in the Classical World, Oxford University Press, 2018, p. 409–430.
+Jean Letrouit, "Chronologie des alchimistes grecs," in Didier Kahn and Sylvain Matton, Alchimie: art, histoire et mythes, SEHA-Archè, 1995, p. 11–93.
+Lindsay, Jack. The Origins of Alchemy in Greco-Roman Egypt. Barnes & Noble, 1970.
+Paul Magdalino and Maria Mavroudi (eds.), The Occult Sciences in Byzantium, La Pomme d'or, 2006.
+Martelli, Matteo (2014). "The Alchemical Art of Dyeing: The Fourfold Division of Alchemy and the Enochian Tradition". Laboratories of Art. Archimedes. Vol. 37. Cham: Springer International Publishing. pp. 1–22. doi:10.1007/978-3-319-05065-2_1. ISBN 978-3-319-05064-5.
+Matteo Martelli, " Alchemy, Medicine and Religion: Zosimus of Panopolis and the Egyptian Priests ", Religion in the Roman Empire 3.2 (2017), p. 202–220.
+Merianos, Gerasimos (2017). "Alchemy". The Cambridge Intellectual History of Byzantium. Cambridge University Press. pp. 234–251. doi:10.1017/9781107300859.015. ISBN 978-1-107-30085-9.
+Greek Alchemy from Late Antiquity to Early Modernity. De Diversis Artibus. Vol. 104. Turnhout: Brepols Publishers. 2018. doi:10.1484/m.dda-eb.5.116173. ISBN 978-2-503-58191-0.
+Daniel Stolzenberg, " Unpropitious Tinctures: Alchemy, Astrology & Gnosis According to Zosimos of Panopolis ", Archives internationales d'histoire des sciences 49 (1999), p. 3–31.
+Cristina Viano, " Byzantine Alchemy, or the Era of Systematization ", in John Scarborough and Paul Keyser (eds.), Oxford Handbook of Science and Medicine in the Classical World, Oxford University Press, 2018, p. 943–964.
+Vlachou, C.; McDonnell, J.G.; Janaway, R.C. (2002). "Experimental investigation of silvering in late Roman coinage". MRS Proceedings. 712 II9.2. doi:10.1557/PROC-712-II9.2. ISSN 0272-9172.
+
+=== Early modern ===
+Principe, Lawrence and William Newman. Alchemy Tried in the Fire: Starkey, Boyle, and the Fate of Helmontian Chymistry. University of Chicago Press, 2002.
+
+== External links ==
+
+ Media related to Alchemy at Wikimedia Commons
+SHAC: Society for the History of Alchemy and Chemistry
+ESSWE: European Society for the Study of Western Esotericism
+Association for the Study of Esotericism

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+True alchemy never regarded earth, air, water, and fire as corporeal or chemical substances in the present-day sense of the word. The four elements are simply the primary, and most general, qualities by means of which the amorphous and purely quantitative substance of all bodies first reveals itself in differentiated form." Later alchemists extensively developed the mystical aspects of this concept.
+Alchemy coexisted alongside emerging Christianity. Lactantius believed Hermes Trismegistus had prophesied its birth. Augustine of Hippo later affirmed this in the 4th and 5th centuries, but also condemned Trismegistus for idolatry. Examples of pagan, Christian, and Jewish alchemists can be found during this period.
+Most of the Greco-Roman alchemists preceding Zosimos are known only by pseudonyms, such as Moses of Alexandria, Isis, Cleopatra the Alchemist, Pseudo-Democritus, and Ostanes. Other authors such as Komarios and Chymes are known only through surviving fragments of text. After AD 400, Greek alchemical writers occupied themselves solely in commenting on the works of these predecessors. By the middle of the 7th century, alchemy was almost an entirely mystical discipline. It was at that time that Khalid Ibn Yazid sparked its migration from Alexandria to the Islamic world, facilitating the translation and preservation of Greek alchemical texts in the 8th and 9th centuries.
+
+=== Byzantium ===
+Greek alchemy was preserved in medieval Byzantine manuscripts after the fall of Roman Egypt, yet historians have only relatively recently begun to study and development of Greek alchemy in the Byzantine period.
+
+=== India ===
+
+The 2nd millennium BC Vedas describe a connection between eternal life and gold. A considerable knowledge of metallurgy has been exhibited in a third-century AD Arthashastra, which provides ingredients of explosives (agniyoga) and salts extracted from fertile soils and plant remains (yavakshara) such as saltpetre/nitre, perfume (different qualities of perfumes are mentioned), and granulated (refined) sugar. Buddhist texts from the 2nd to 5th centuries mention the transmutation of base metals to gold. According to some scholars Greek alchemy may have influenced Indian alchemy but there are no hard evidences to back this claim.
+
+The 11th-century Persian chemist and physician Abū Rayhān Bīrūnī, who visited Gujarat as part of the court of Mahmud of Ghazni, reported locals have a science similar to alchemy which is quite peculiar to them, which in Sanskrit is called Rasāyana and in Persian Rasavātam. It means the art of obtaining/manipulating Rasa: nectar, mercury, and juice. This art was restricted to certain operations, metals, drugs, compounds, and medicines, many of which have mercury as their core element. Its principles restored the health of those who were ill beyond hope and gave back youth to fading old age.
+The goals of alchemy in India included the creation of a divine body (divya-deham) and immortality while still embodied (jīvan-mukti). Sanskrit alchemical texts include much material on the manipulation of mercury and sulphur, that are homologized with the semen of the god Śiva and the menstrual blood of the goddess Devī.
+Some early alchemical writings seem to have their origins in the Kaula tantric schools associated to the teachings of the personality of Matsyendranath. Other early writings are found in the Jaina medical treatise Kalyāṇakārakam of Ugrāditya, written in South India in the early 9th century.
+Two famous early Indian alchemical authors were Nāgārjuna Siddha and Nityanātha Siddha. Nāgārjuna Siddha was a Buddhist monk. His book Rasendramangalam is an example of Indian alchemy and medicine. Nityanātha Siddha wrote Rasaratnākara, which was also a highly influential work. In Sanskrit, rasa translates to "mercury", and Nāgārjuna Siddha was said to have developed a method of converting mercury into gold. An example of academic scholarship on Indian alchemy is The Alchemical Body by Indologist David Gordon White. A modern bibliography on Indian alchemical studies has been written by White.
+The contents of 39 Sanskrit alchemical treatises have been analysed in detail in Gerrit Jan Meulenbeld's History of Indian Medical Literature (HIML). The discussion of these works in the HIML gives a summary of the contents of each work, their special features, and where possible the evidence concerning their dating. Chapter 13 of the HIML, Various works on rasaśāstra and ratnaśāstra ('Various works on alchemy and gems') gives brief details of another 655 treatises. In some cases, Meulenbeld gives notes on the contents and authorship of these works; in other cases references are made only to the unpublished manuscripts of these titles. A great deal remains to be discovered about Indian alchemical literature.
+
+=== Islamic world ===
+
+After the fall of the Roman Empire, the focus of alchemical development moved to the Islamic World. Much more is known about Islamic alchemy because it was better documented: indeed, most of the earlier writings that have come down through the years were preserved as Arabic translations. The word alchemy itself was derived from the Arabic word al-kīmiyā (الكيمياء). The early Islamic world was a melting pot for alchemy. Platonic and Aristotelian thought, which had already been somewhat appropriated into Hermetic science, continued to be assimilated during the late 7th and early 8th centuries through Syriac translations and scholarship.
+In the late ninth and early tenth centuries, the Arabic works attributed to Jābir ibn Hayyān (Latinized as "Geber" or "Geberus") introduced a new approach to alchemy. Paul Kraus, who wrote the standard reference work on ibn Hayyan, put it as follows:

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+To form an idea of the historical place of Jabir's alchemy and to tackle the problem of its sources, it is advisable to compare it with what remains to us of the alchemical literature in the Greek language. One knows in which miserable state this literature reached us. Collected by Byzantine scientists from the tenth century, the corpus of the Greek alchemists is a cluster of incoherent fragments, going back to all the times since the third century until the end of the Middle Ages.
+The efforts of Berthelot and Ruelle to put a little order in this mass of literature led only to poor results, and the later researchers, among them in particular Mrs. Hammer-Jensen, Tannery, Lagercrantz, von Lippmann, Reitzenstein, Ruska, Bidez, Festugière and others, could make clear only few points of detail ....
+The study of the Greek alchemists is not very encouraging. An even surface examination of the Greek texts shows that a very small part only was organized according to true experiments of laboratory: even the supposedly technical writings, in the state where we find them today, are unintelligible nonsense which refuses any interpretation.
+
+It is different with Jabir's alchemy. The relatively clear description of the processes and the alchemical apparati, the methodical classification of the substances, mark an experimental spirit which is extremely far away from the weird and odd esotericism of the Greek texts. The theory on which Jabir supports his operations is one of clearness and of an impressive unity. More than with the other Arab authors, one notes with him a balance between theoretical teaching and practical teaching, between the 'ilm and the amal. In vain one would seek in the Greek texts a work as systematic as that which is presented, for example, in the Book of Seventy.
+Islamic philosophers also made great contributions to alchemical Hermeticism. The most influential author in this regard was arguably ibn Hayyan. ibn Hayyan's ultimate goal was takwin, the artificial creation of life in the alchemical laboratory—up to and including human life. He analysed each Aristotelian element in terms of four basic qualities of hotness, coldness, dryness, and moistness. According to ibn Hayyan, in each metal two of these qualities were interior and two were exterior. For example, lead was externally cold and dry, while gold was hot and moist. Thus, ibn Hayyan theorized, by rearranging the qualities of one metal, a different metal would result. By this reasoning, the search for the philosopher's stone was introduced to Western alchemy. Ibn Hayyan developed an elaborate numerology whereby the root letters of a substance's name in Arabic, when treated with various transformations, held correspondences to the element's physical properties. The atomic theory of corpuscularianism, where all physical bodies possess an inner and outer layer of minute particles or corpuscles, also has its origins in the work of ibn Hayyan.
+From the 9th to 14th centuries, alchemical theories faced criticism from a variety of practical Muslim chemists, including Al-Kindi, Abū al-Rayhān al-Bīrūnī, Avicenna and Ibn Khaldun. In particular, they wrote refutations against the idea of the transmutation of metals. From the 14th century onwards, many materials and practices originally belonging to Indian alchemy (Rasayana) were assimilated in the Persian texts written by Muslim scholars.
+
+=== East Asia ===
+
+Researchers have found evidence that Chinese alchemists and philosophers discovered complex mathematical phenomena that were shared with Arab alchemists during the medieval period. Discovered first in China before the Common Era, the "magic square of three" was propagated to followers of Jabir ibn Hayyan at some point over the proceeding several hundred years. Other commonalities shared between the two alchemical schools of thought include discrete naming for ingredients and heavy influence from the natural elements. The Silk Road provided a clear path for the exchange of goods, ideas, ingredients, religion, and many other aspects of life with which alchemy is intertwined.

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+Whereas European alchemy eventually centered on the transmutation of base metals into noble metals, Chinese alchemy had a more obvious connection to medicine. The philosopher's stone of European alchemists can be compared to the elixir of life sought by Chinese alchemists. In the Hermetic view, these two goals were not unconnected, and the philosopher's stone was often equated with the universal panacea; therefore, the two traditions may have had more in common than initially appears.
+As early as 317 AD, Ge Hong documented the use of metals, minerals, and elixirs in early Chinese medicine. Hong identified three ancient Chinese documents—titled the Scripture of Great Clarity, the Scripture of the Nine Elixirs, and the Scripture of the Golden Liquor—as texts containing fundamental alchemical information. He also described alchemy, along with meditation, as the sole spiritual practices that could allow one to gain immortality or to transcend to a higher state of being. In his work Inner Chapters of the Book of the Master Who Embraces Spontaneous Nature (317 AD), Hong argued that alchemical solutions such as elixirs were preferable to traditional medicinal treatment due to the spiritual protection they could provide. In the centuries following Ge Hong's death, the emphasis placed on alchemy as a spiritual practice among Chinese Taoists was reduced. In 499 AD, Tao Hongjing refuted Hong's statement that alchemy is as important a spiritual practice as Shangqing meditation. While Hongjing did not deny the power of alchemical elixirs to grant immortality or provide divine protection, he ultimately found the Scripture of the Nine Elixirs to be ambiguous and spiritually unfulfilling, aiming to implement more accessible practising techniques.
+In the early 700s, Neidan (a.k.a. internal alchemy) was adopted by Daoists as a new form of alchemy. Neidan emphasized appeasing the inner gods that inhabit the human body by practising alchemy with compounds naturally found in the body, rather than the mixing of natural resources that was so emphasized in early Dao alchemy. For example, saliva was often considered nourishment for the inner gods and did not require any conscious alchemical reaction to produce. The inner gods were not thought of as physical presences occupying each person, but rather a collection of deities that are each said to represent and protect a specific body part or region. Although those who practised Neidan prioritized meditation over external alchemical strategies, many of the same elixirs and constituents from previous Daoist alchemical schools of thought continued to be utilized in tandem with meditation. Eternal life remained a consideration for Neidan alchemists, as it was believed that one would become immortal if an inner god were to be immortalized within them through spiritual fulfilment.
+Chinese alchemy was closely connected to Taoist techniques in traditional Chinese medicine like acupuncture and moxibustion. In the early Song dynasty, followers of this Taoist idea—chiefly the elite and upper class—would ingest mercuric sulfide, which, though tolerable in low levels, led many to suicide. Thinking that this consequential death would lead to freedom and access to Tian, the ensuing deaths encouraged practitioners to eschew this method of alchemy in favour of external sources (e.g., the aforementioned Tai Chi Chuan and mastering of one's qi,.) Chinese alchemy was introduced to the West by Obed Simon Johnson.
+
+=== Medieval Europe ===

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+The introduction of alchemy to Latin Europe may be dated to 11 February 1144, with the completion of Robert of Chester's translation of the Liber de compositione alchemiae (Book on the Composition of Alchemy) from an Arabic work attributed to Khalid ibn Yazid. Although European craftsmen and technicians pre-existed, Robert notes in his preface that alchemy (here still referring to the elixir rather than to the art itself) was unknown in Latin Europe at the time of his writing. The translation of Arabic texts concerning numerous disciplines including alchemy flourished in 12th-century Toledo, Spain, through contributors like Gerard of Cremona and Adelard of Bath. Translations of the time included the Turba Philosophorum, and the works of Avicenna and Muhammad ibn Zakariya al-Razi. These brought with them many new words to the European vocabulary for which there was no previous Latin equivalent. Alcohol, carboy, elixir, and athanor are examples.
+Meanwhile, theologian contemporaries of the translators made strides towards the reconciliation of faith and experimental rationalism, thereby priming Europe for the influx of alchemical thought. The 11th-century theologian Anselm of Canterbury put forth the opinion that faith and rationalism were compatible and encouraged rationalism in a Christian context. In the early 12th century, Peter Abelard followed Anselm's work, laying down the foundation for acceptance of Aristotelian thought before the first works of Aristotle had reached the West. In the early 13th century, Robert Grosseteste used Abelard's methods of analysis and added the use of observation, experimentation, and conclusions when conducting scientific investigations. Grosseteste also did much work to reconcile Platonic and Aristotelian thinking.
+Through much of the 12th and 13th centuries, alchemical knowledge in Europe remained centered on translations, and new Latin contributions were not made. The efforts of the translators were succeeded by that of the encyclopaedists. In the 13th century, Albertus Magnus and Roger Bacon were the most notable of these, their work summarizing and explaining the newly imported alchemical knowledge in Aristotelian terms. Albertus Magnus, a Dominican friar, is known to have written works such as the Book of Minerals where he observed and commented on the operations and theories of alchemical authorities like Hermes Trismegistus, pseudo-Democritus, and unnamed alchemists of his time. Albertus critically compared these to the writings of Aristotle and Avicenna, where they concerned the transmutation of metals. From the time shortly after his death through to the 15th century, more than 28 alchemical tracts were misattributed to him, a common practice giving rise to his reputation as an accomplished alchemist. Likewise, alchemical texts have been attributed to Albert's student Thomas Aquinas.
+Roger Bacon, a Franciscan Order friar who wrote on a wide variety of topics, including optics, comparative linguistics, and medicine, composed his Great Work (Opus Majus) for Pope Clement IV as part of a project towards rebuilding the medieval university curriculum to include the new learning of his time. While alchemy was not more important to him than other sciences and he did not produce allegorical works on the topic, he did consider it and astrology to be important parts of both natural philosophy and theology and his contributions advanced alchemy's connections to soteriology and Christian theology. Bacon's writings integrated morality, salvation, alchemy, and the prolongation of life. His correspondence with Clement highlighted this, noting the importance of alchemy to the papacy. Like the Greeks before him, Bacon acknowledged the division of alchemy into practical and theoretical spheres. He noted that the theoretical lay outside the scope of Aristotle, the natural philosophers, and all Latin writers of his time. The practical confirmed the theoretical, and Bacon advocated its uses in natural science and medicine. In later European legend, he became an archmage. In particular, along with Albertus Magnus, he was credited with the forging of a brazen head capable of answering its owner's questions.
+Soon after Bacon, the influential work of Pseudo-Geber (sometimes identified as Paul of Taranto) appeared. His Summa Perfectionis remained a staple summary of alchemical practice and theory through the medieval and renaissance periods. It was notable for its inclusion of practical chemical operations alongside sulphur-mercury theory, and the unusual clarity with which they were described. By the end of the 13th century, alchemy had developed into a fairly structured system of belief. Adepts believed in the macrocosm-microcosm theories of Hermes; namely, that processes that affect minerals and other substances could have an effect on the human body (for example, if one could learn the secret of purifying gold, one could use the technique to purify the human soul). They believed in the four elements and the four qualities as described above, and they had a strong tradition of cloaking their written ideas in a labyrinth of coded jargon set with traps to mislead the uninitiated. Finally, the alchemists practised their art: they actively experimented with chemicals and made observations and theories about how the universe operated. Their entire philosophy revolved around their belief that the human soul was divided within itself after the fall of Adam. By purifying the two parts of humankind's soul, humans could be reunited with God.

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+In the 14th century, alchemy became more accessible to Europeans outside the confines of Latin-speaking churchmen and scholars. Alchemical discourse shifted from scholarly philosophical debate to an exposed social commentary on the alchemists themselves. Dante, Piers Plowman, and Chaucer all painted unflattering pictures of alchemists as thieves and liars. Pope John XXII's 1317 edict Spondent quas non-exhibent forbade the false promises of transmutation made by pseudo-alchemists. Roman Catholic Inquisitor General Nicholas Eymerich's Directorium Inquisitorum, written in 1376, associated alchemy with the performance of demonic rituals, which Eymerich differentiated from magic performed in accordance with Christian scripture. This did not, however, lead to any change in the Inquisition's monitoring or prosecution of alchemists. In 1404, Henry IV of England banned the practice of multiplying metals by the passing of the Gold and Silver Act 1403 (5 Hen. 4. c. 4) (although it was possible to buy a licence to attempt to make gold alchemically, and a number were granted by Henry VI and Edward IV). These critiques and regulations centered more around pseudo-alchemical charlatanism than the actual study of alchemy, which continued with an increasingly Christian tone. The 14th century saw the Christian imagery of death and resurrection employed in the alchemical texts of Petrus Bonus, John of Rupescissa, and in works written in the name of Raymond Lull and Arnold of Villanova.
+
+Nicolas Flamel is a well-known alchemist to the point where he had many pseudepigraphic imitators. Although the historical Flamel existed, the writings and legends assigned to him only appeared in 1612.
+A common idea in European alchemy in the medieval era was a metaphysical "Homeric chain of wise men that link[ed] heaven and earth" that included ancient pagan philosophers and other important historical figures.
+
+=== Renaissance and early modern Europe ===
+
+During the Renaissance, Hermetic and Platonic foundations were restored to European alchemy. The dawn of medical, pharmaceutical, occult, and entrepreneurial branches of alchemy followed. In the late 15th century, Marsilio Ficino translated the Corpus Hermeticum and the works of Plato into Latin. These were previously unavailable to Europeans who for the first time had a full picture of the alchemical theory that Bacon had declared absent. Renaissance Humanism and Renaissance Neoplatonism guided alchemists away from physics to refocus on mankind as the alchemical vessel.
+Esoteric systems developed that blended alchemy into a broader occult Hermeticism, fusing it with magic, astrology, and Christian Kabbalah. A key figure in this development was Heinrich Cornelius Agrippa (1486–1535), a German who received his Hermetic education in Italy in the schools of the humanists. In his De Occulta Philosophia, he attempted to merge Judaism's Kabbalah, Hermeticism, and alchemy. He was instrumental in spreading this new blend of Hermeticism outside the borders of Italy.
+Paracelsus, born Philippus Aureolus Theophrastus Bombastus von Hohenheim (1493–1541), cast alchemy into a new form, rejecting some of Agrippa's occultism and moving away from chrysopoeia. Paracelsus pioneered the use of chemicals and minerals in medicine and wrote, "Many have said of Alchemy, that it is for the making of gold and silver. For me such is not the aim, but to consider only what virtue and power may lie in medicines."
+His Hermetical views were that sickness and health in the body relied on the harmony of humankind as the microcosm and Nature the macrocosm. He took an approach different from those before him, using this analogy not in the manner of soul-purification but in the manner that humans must have certain balances of minerals in their bodies, and that certain illnesses of the body had chemical remedies that could cure them. Iatrochemistry refers to the pharmaceutical applications of alchemy championed by Paracelsus.
+John Dee (13 July 1527 – December 1608) followed Agrippa's occult tradition. Although better known for angel summoning, divination, and his role as astrologer, cryptographer, and consultant to Elizabeth I of England, Dee's alchemical Monas Hieroglyphica, written in 1564 was his most popular and influential work. His writing portrayed alchemy as a sort of terrestrial astronomy in line with the Hermetic axiom as above, so below. During the 17th century, a short-lived "supernatural" interpretation of alchemy became popular, including support by fellows of the Royal Society: Robert Boyle and Elias Ashmole. Proponents of the supernatural interpretation of alchemy believed that the philosopher's stone might be used to summon and communicate with angels.
+
+Entrepreneurial opportunities were common for the alchemists of Renaissance Europe. Alchemists were contracted by the elite for practical purposes related to mining, medical services, and the production of chemicals, medicines, metals, and gemstones. Rudolf II, Holy Roman Emperor, in the late 16th century, famously received and sponsored various alchemists at his court in Prague, including Dee and his associate Edward Kelley. King James IV of Scotland, Julius, Duke of Brunswick-Lüneburg, Henry V, Duke of Brunswick-Lüneburg, Augustus, Elector of Saxony, Julius Echter von Mespelbrunn, and Maurice, Landgrave of Hesse-Kassel all contracted alchemists. John's son Arthur Dee worked as a court physician to Michael I of Russia and Charles I of England but also compiled the alchemical book Fasciculus Chemicus.

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+
+Although most of these appointments were legitimate, the trend of pseudo-alchemical fraud continued through the Renaissance. Betrüger would use sleight of hand, or claims of secret knowledge to make money or secure patronage. Legitimate mystical and medical alchemists such as Michael Maier and Heinrich Khunrath wrote about fraudulent transmutations, distinguishing themselves from the con artists. False alchemists were sometimes prosecuted for fraud.
+The terms "chemia" and "alchemia" were used as synonyms in the early modern period, and the differences between alchemy, chemistry and small-scale assaying and metallurgy were not as neat as in the present day. There were important overlaps between practitioners, and trying to classify them into alchemists, chemists and craftsmen is anachronistic. For example, Tycho Brahe (1546–1601), an alchemist better known for his astronomical and astrological investigations, had a laboratory built at his Uraniborg observatory/research institute. Michael Sendivogius (Michał Sędziwój, 1566–1636), a Polish alchemist, philosopher, medical doctor and pioneer of chemistry wrote mystical works but is also credited with distilling oxygen in a lab sometime around 1600. Sendivogious taught his technique to Cornelius Drebbel who, in 1621, applied this in a submarine. Isaac Newton devoted considerably more of his writing to the study of alchemy (see Isaac Newton's occult studies) than he did to either optics or physics. Other early modern alchemists who were eminent in their other studies include Robert Boyle, and Jan Baptist van Helmont. Their Hermeticism complemented rather than precluded their practical achievements in medicine and science.
+
+=== Later modern period ===
+
+The decline of European alchemy was brought about by the rise of modern science with its emphasis on rigorous quantitative experimentation and its disdain for "ancient wisdom". Although the seeds of these events were planted as early as the 17th century, alchemy still flourished for some two hundred years, and in fact may have reached its peak in the 18th century. As late as 1781 James Price claimed to have produced a powder that could transmute mercury into silver or gold. Early modern European alchemy continued to exhibit a diversity of theories, practices, and purposes: "Scholastic and anti-Aristotelian, Paracelsian and anti-Paracelsian, Hermetic, Neoplatonic, mechanistic, vitalistic, and more—plus virtually every combination and compromise thereof."
+Robert Boyle (1627–1691) pioneered the scientific method in chemical investigations. He assumed nothing in his experiments and compiled every piece of relevant data. Boyle would note the place in which the experiment was carried out, the wind characteristics, the position of the Sun and Moon, and the barometer reading, all just in case they proved to be relevant. This approach eventually led to the founding of modern chemistry in the 18th and 19th centuries, based on revolutionary discoveries and ideas of Lavoisier and John Dalton.
+Beginning around 1720, a rigid distinction began to be drawn for the first time between "alchemy" and "chemistry". By the 1740s, "alchemy" was now restricted to the realm of gold making, leading to the popular belief that alchemists were charlatans, and the tradition itself nothing more than a fraud. In order to protect the developing science of modern chemistry from the negative censure to which alchemy was being subjected, academic writers during the 18th-century scientific Enlightenment attempted to divorce and separate the "new" chemistry from the "old" practices of alchemy. This move was mostly successful, and the consequences of this continued into the 19th, 20th and 21st centuries.
+During the occult revival of the early 19th century, alchemy received new attention as an occult science. The esoteric or occultist school that arose during the 19th century held the view that the substances and operations mentioned in alchemical literature are to be interpreted in a spiritual sense, less than as a practical tradition or protoscience. This interpretation claimed that the obscure language of the alchemical texts, which 19th century practitioners were not always able to decipher, were an allegorical guise for spiritual, moral or mystical processes.
+Two seminal figures during this period were Mary Anne Atwood and Ethan Allen Hitchcock, who independently published similar works regarding spiritual alchemy. Both rebuffed the growing successes of chemistry, developing a completely esoteric view of alchemy. Atwood wrote: "No modern art or chemistry, notwithstanding all its surreptitious claims, has any thing in common with Alchemy." Atwood's work influenced subsequent authors of the occult revival including Eliphas Levi, Arthur Edward Waite, and Rudolf Steiner. Hitchcock, in his Remarks Upon Alchymists (1855) attempted to make a case for his spiritual interpretation with his claim that the alchemists wrote about a spiritual discipline under a materialistic guise in order to avoid accusations of blasphemy from the church and state. In 1845, Baron Carl Reichenbach, published his studies on Odic force, a concept with some similarities to alchemy, but his research did not enter the mainstream of scientific discussion.
+In 1946, Louis Cattiaux published the Message Retrouvé, a work that was at once philosophical, mystical and highly influenced by alchemy. In his lineage, many researchers, including Emmanuel and Charles d'Hooghvorst, are updating alchemical studies in France and Belgium.

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+
+=== Women ===
+Several women appear in the earliest history of alchemy. Michael Maier names four women who were able to make the philosophers' stone: Mary the Jewess, Cleopatra the Alchemist, Medera, and Taphnutia. Zosimos's sister Theosebia (later known as Euthica the Arab) and Isis the Prophetess also played roles in early alchemical texts.
+The first alchemist whose name we know was Mary the Jewess (c. 200 A.D.). Early sources claim that Mary (or Maria) devised a number of improvements to alchemical equipment and tools as well as novel techniques in chemistry. Her best known advances were in heating and distillation processes. The laboratory water-bath, known eponymously (especially in France) as the bain-marie, is said to have been invented or at least improved by her. Essentially a double-boiler, it was (and is) used in chemistry for processes that required gentle heating. The tribikos (a modified distillation apparatus) and the kerotakis (a more intricate apparatus used especially for sublimations) are two other advancements in the process of distillation that are credited to her. Although we have no writing from Mary herself, she is known from the early-fourth-century writings of Zosimos of Panopolis. After the Greco-Roman period, women's names appear less frequently in alchemical literature.
+Towards the end of the Middle Ages and beginning of the Renaissance, due to the emergence of print, women were able to access the alchemical knowledge from texts of the preceding centuries. Caterina Sforza, the Countess of Forlì and Lady of Imola, is one of the few confirmed female alchemists after Mary the Jewess. As she owned an apothecary, she would practice science and conduct experiments in her botanic gardens and laboratories. Being knowledgeable in alchemy and pharmacology, she recorded all of her alchemical ventures in a manuscript named Experimenti ('Experiments'). The manuscript contained more than four hundred recipes covering alchemy as well as cosmetics and medicine. One of these recipes was for the water of talc. Talc, which makes up talcum powder, is a mineral which, when combined with water and distilled, was said to produce a solution which yielded many benefits. These supposed benefits included turning silver to gold and rejuvenation. When combined with white wine, its powder form could be ingested to counteract poison. Furthermore, if that powder was mixed and drunk with white wine, it was said to be a source of protection from any poison, sickness, or plague. Other recipes were for making hair dyes, lotions, lip colours. There was also information on how to treat a variety of ailments from fevers and coughs to epilepsy and cancer. In addition, there were instructions on producing the quintessence (or aether), an elixir which was believed to be able to heal all sicknesses, defend against diseases, and perpetuate youthfulness. She also wrote about creating the illustrious philosophers' stone.
+Some women known for their interest in alchemy were Catherine de' Medici, the Queen of France, and Marie de' Medici, the following Queen of France, who carried out experiments in her personal laboratory. Also, Isabella d'Este, the Marchioness of Mantua, made perfumes herself to serve as gifts. Due to the proliferation in alchemical literature of pseudepigrapha and anonymous works, however, it is difficult to know which of the alchemists were actually women. This contributed to a broader pattern in which male authors credited prominent noblewomen for beauty products with the purpose of appealing to a female audience. For example, in Ricettario galante ("Gallant Recipe-Book"), the distillation of lemons and roses was attributed to Elisabetta Gonzaga, the duchess of Urbino. In the same book, Isabella d'Aragona, the daughter of Alfonso II of Naples, is accredited for recipes involving alum and mercury. Ippolita Maria Sforza is even referred to in an anonymous manuscript about a hand lotion created with rose powder and crushed bones.
+As the sixteenth century went on, scientific culture flourished and people began collecting "secrets". During this period "secrets" referred to experiments, and the most coveted ones were not those which were bizarre, but the ones which had been proven to yield the desired outcome.  In this period, the only book of secrets ascribed to a woman was I secreti della signora Isabella Cortese ('The Secrets of Signora Isabella Cortese'). This book contained information on how to turn base metals into gold, medicine, and cosmetics. However, it is rumoured that a man, Girolamo Ruscelli, was the real author and only used a female voice to attract female readers.
+In the nineteenth-century, Mary Anne Atwood's A Suggestive Inquiry into the Hermetic Mystery (1850) marked the return of women during the occult revival.
+
+=== Modern historical research ===
+The history of alchemy has become a recognized subject of academic study. As the language of the alchemists is analysed, historians are becoming more aware of the connections between that discipline and other facets of Western cultural history, such as the evolution of science and philosophy, the sociology and psychology of the intellectual communities, kabbalism, spiritualism, Rosicrucianism, and other mystic movements. Institutions involved in this research include The Chymistry of Isaac Newton project at Indiana University, the University of Exeter Centre for the Study of Esotericism (EXESESO), the European Society for the Study of Western Esotericism (ESSWE), and the University of Amsterdam's Sub-department for the History of Hermetic Philosophy and Related Currents. A large collection of books on alchemy is kept in the Bibliotheca Philosophica Hermetica in Amsterdam.
+Journals which publish regularly on the topic of Alchemy include Ambix, published by the Society for the History of Alchemy and Chemistry, and Isis, published by the History of Science Society.
+
+== Core concepts ==

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+
+Western alchemical theory corresponds to the worldview of late antiquity in which it was born. Concepts were imported from Neoplatonism and earlier Greek cosmology. As such, the classical elements appear in alchemical writings, as do the seven classical planets and the corresponding seven metals of antiquity. Similarly, the gods of the Roman pantheon who are associated with these luminaries are discussed in alchemical literature. The concepts of prima materia and anima mundi are central to the theory of the philosopher's stone.
+
+=== Magnum opus ===
+
+The Great Work of Alchemy is often described as a series of four stages represented by colours.
+
+nigredo, a blackening or melanosis
+albedo, a whitening or leucosis
+citrinitas, a yellowing or xanthosis
+rubedo, a reddening, purpling, or iosis
+
+== Modernity ==
+Due to the complexity and obscurity of alchemical literature, and the 18th-century diffusion of remaining alchemical practitioners into the area of chemistry, the general understanding of alchemy in the 19th and 20th centuries was influenced by several distinct and radically different interpretations. Those focusing on the exoteric, such as historians of science Lawrence M. Principe and William R. Newman, have interpreted the Decknamen ('code words') of alchemy as physical substances. These scholars have reconstructed physicochemical experiments that they say are described in medieval and early modern texts. At the opposite end of the spectrum, focusing on the esoteric, scholars, such as Florin George Călian and Anna Marie Roos, who question the reading of Principe and Newman, interpret these same Decknamen as spiritual, religious, or psychological concepts.
+New interpretations of alchemy are still perpetuated, sometimes merging with concepts from New Age or radical environmentalism movements. Groups like the Rosicrucians and Freemasons have a continued interest in alchemy and its symbolism. Since the Victorian revival of alchemy, "occultists reinterpreted alchemy as a spiritual practice, involving the self-transformation of the practitioner and only incidentally or not at all the transformation of laboratory substances", which has contributed to a merger of magic and alchemy in popular thought.
+
+=== Esoteric interpretations of historical texts ===
+In the eyes of a variety of modern esoteric and neo-Hermetic practitioners, alchemy is primarily spiritual. In this interpretation, transmutation of lead into gold is presented as an analogy for personal transmutation, purification, and perfection.
+According to this view, early alchemists, such as Zosimos of Panopolis (c. 300 AD), highlighted the spiritual nature of the alchemical quest, symbolic of a religious regeneration of the human soul. This approach is held to have continued in the Middle Ages, as metaphysical aspects, substances, physical states, and material processes are supposed to have been used as metaphors for spiritual entities, spiritual states, and, ultimately, transformation. In this sense, the literal meanings of alchemical formulas hid a spiritual philosophy. In the neo-Hermeticist interpretation, both the transmutation of common metals into gold and the universal panacea are held to symbolize evolution from an imperfect, diseased, corruptible, and ephemeral state toward a perfect, healthy, incorruptible, and everlasting state, so the philosopher's stone then represented a mystic key that would make this evolution possible. Applied to the alchemist, the twin goal symbolized their evolution from ignorance to enlightenment, and the stone represented a hidden spiritual truth or power that would lead to that goal. In texts that are believed to have been written according to this view, the cryptic alchemical symbols, diagrams, and textual imagery of late alchemical works are supposed to contain multiple layers of meanings, allegories, and references to other equally cryptic works, which must be laboriously decoded to discover their true meaning.
+In his 1766 Alchemical Catechism, Théodore Henri de Tschudi suggested that the usage of the metals was symbolic:
+
+=== Psychology ===
+Alchemical symbolism was important in analytical psychology. It was revived and popularized from near extinction by the Swiss psychologist Carl Gustav Jung. Jung was initially confounded and at odds with alchemy and its images but after being given a copy of The Secret of the Golden Flower, a Chinese alchemical text translated by his friend Richard Wilhelm, he discovered a direct correlation or parallel between the symbolic images in the alchemical drawings and the inner, symbolic images coming up in his patients' dreams, visions, or fantasies. He observed these alchemical images occurring during the psychic process of transformation, a process that Jung called "individuation". Specifically, he regarded the conjuring up of images of gold or Lapis as symbolic expressions of the origin and goal of this "process of individuation". Together with his alchemical mystica soror (mystical sister), Jungian Swiss analyst Marie-Louise von Franz, Jung began collecting old alchemical texts, compiled a lexicon of key phrases with cross-references, and pored over them. The volumes of work he wrote shed new light on understanding the art of transubstantiation and renewed alchemy's popularity as a symbolic process of coming into wholeness as a human being, where opposites are brought into contact and inner and outer, spirit and matter are reunited in the hieros gamos, or divine marriage. His writings are influential in general psychology, especially for those interested in understanding the importance of dreams, symbols, and the unconscious archetypal forces (Jungian archetypes) that comprise all psychic life.
+Both von Franz and Jung contributed significantly to the subject and work of alchemy and to its continued presence in psychology and contemporary culture. Among the volumes Jung wrote on alchemy, his magnum opus is volume 14 of his Collected Works, Mysterium Coniunctionis.
+
+=== Literature ===

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+
+The Antikythera mechanism ( AN-tik-ih-THEER-ə, US also  AN-ty-kih-) is an ancient Greek hand-powered orrery (model of the Solar System). It is the oldest known example of an analogue computer. It could be used to predict astronomical positions and eclipses decades in advance. It could also be used to track the four-year cycle of athletic games similar to an olympiad, the cycle of the ancient Olympic Games.
+The artefact was among wreckage retrieved from a shipwreck off the coast of the Greek island Antikythera in 1901. In 1902, during a visit to the National Archaeological Museum in Athens, it was noticed by Greek politician Spyridon Stais as containing a gear, prompting the first study of the fragment by his cousin, Valerios Stais, the museum director. The device, housed in the remains of a wooden-framed case of (uncertain) overall size 34 cm × 18 cm × 9 cm (13.4 in × 7.1 in × 3.5 in), was found as one lump, later separated into three main fragments which are now divided into 82 separate fragments after conservation efforts. Four of these fragments contain gears, while inscriptions are found on many others. The largest gear is about 13 cm (5 in) in diameter and originally had 223 teeth. All these fragments of the mechanism are kept at the National Archaeological Museum, along with reconstructions and replicas, to demonstrate how it may have looked and worked.
+In 2005, a team from Cardiff University led by Mike Edmunds used computer X-ray tomography and high resolution scanning to image inside fragments of the crust-encased mechanism and read faint inscriptions that once covered the outer casing. These scans suggest that the mechanism had 37 meshing bronze gears enabling it to follow the movements of the Moon and the Sun through the zodiac, to predict eclipses and to model the irregular orbit of the Moon, where the Moon's velocity is higher in its perigee than in its apogee. This motion was studied in the 2nd century BC by astronomer Hipparchus of Rhodes, and he may have been consulted in the machine's construction. There is speculation that a portion of the mechanism is missing and it calculated the positions of the five classical planets. The inscriptions were further deciphered in 2016, revealing numbers connected with the synodic cycles of Venus and Saturn.
+The instrument is believed to have been designed and constructed by Hellenistic scientists and been variously dated to about 87 BC, between 150 and 100 BC, or 205 BC. It must have been constructed before the shipwreck, which has been dated by multiple lines of evidence to approximately 70–60 BC. In 2022, researchers proposed its initial calibration date, not construction date, could have been 23 December 178 BC. Other experts propose 204 BC as a more likely calibration date. Machines with similar complexity did not appear again until the 14th century in western Europe.
+
+== History ==
+
+=== Discovery ===
+
+Captain Dimitrios Kontos (Δημήτριος Κοντός) and a crew of sponge divers from Symi island discovered the Antikythera wreck in early 1900, and recovered artefacts during the first expedition with the Hellenic Royal Navy, in 1900–1901. This wreck of a Roman cargo ship was found at a depth of 45 metres (148 ft) off Point Glyphadia on the Greek island of Antikythera. The team retrieved numerous large objects, including bronze and marble statues, pottery, unique glassware, jewellery, coins, and the mechanism. The mechanism was retrieved from the wreckage in 1901, probably July. It is unknown how the mechanism came to be on the cargo ship.
+All of the items retrieved from the wreckage were transferred to the National Museum of Archaeology in Athens for storage and analysis. The mechanism appeared to be a lump of corroded bronze and wood. The bronze had turned into atacamite which cracked and shrank when it was brought up from the shipwreck, changing the dimensions of the pieces. It went unnoticed for two years, while museum staff worked on piecing together more obvious treasures, such as the statues. Upon removal from seawater, the mechanism was not treated, resulting in deformational changes.
+On 17 May 1902, archaeologist Valerios Stais, together with his cousin, the Greek politician Spyridon Stais, found one of the pieces of rock had a gear wheel embedded in it. He initially believed that it was an astronomical clock, but most scholars considered the device to be prochronistic, too complex to have been constructed during the same period as the other pieces that had been discovered.
+The German philologist Albert Rehm became interested in the device and was the first to propose that it was an astronomical calculator.
+Investigations into the object lapsed until British science historian and Yale University professor Derek J. de Solla Price became interested in 1951. In 1971, Price and Greek nuclear physicist Charalampos Karakalos made X-ray and gamma-ray images of the 82 fragments. Price published a paper on their findings in 1974.
+Two other searches for items at the Antikythera wreck site in 2012 and 2015 yielded art objects and a second ship which may, or may not, be connected with the treasure ship on which the mechanism was found. Also found was a bronze disc, embellished with the image of a bull. The disc has four "ears" which have holes in them, and it was thought it may have been part of the Antikythera mechanism, as a "cog wheel". There appears to be little evidence that it was part of the mechanism; it is more likely the disc was a bronze decoration on a piece of furniture.

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+
+=== Origin ===
+The Antikythera mechanism is generally referred to as the first known analogue computer. The quality and complexity of the mechanism's manufacture suggests it must have had undiscovered predecessors during the Hellenistic period. Its construction relied on theories of astronomy and mathematics developed by Greek astronomers during the second century BC, and it is estimated to have been built in the late second century BC or the early first century BC.
+In 2008, research by the Antikythera Mechanism Research Project suggested the concept for the mechanism may have originated in the colonies of Corinth, since they identified the calendar on the Metonic Spiral as coming from Corinth, or one of its colonies in northwest Greece or Sicily. Syracuse was a colony of Corinth and the home of Archimedes, and the Antikythera Mechanism Research Project argued in 2008 that it might imply a connection with the school of Archimedes. It was demonstrated in 2017 that the calendar on the Metonic Spiral is of the Corinthian type, but cannot be that of Syracuse. Another theory suggests that coins found by Jacques Cousteau at the wreck site in the 1970s date to the time of the device's construction, and posits that its origin may have been from the ancient Greek city of Pergamon, home of the Library of Pergamum. With its many scrolls of art and science, it was second in importance only to the Library of Alexandria during the Hellenistic period.
+The ship carrying the device contained vases in the Rhodian style, leading to a hypothesis that it was constructed at an academy founded by Stoic philosopher Posidonius on that Greek island. Rhodes was a busy trading port and centre of astronomy and mechanical engineering, home to astronomer Hipparchus, who was active from about 140–120 BC. The mechanism uses Hipparchus' theory for the motion of the Moon, which suggests he may have designed or at least worked on it. It has been argued the astronomical events on the Parapegma of the mechanism work best for latitudes in the range of 33.3–37.0 degrees north; the island of Rhodes is located between the latitudes of 35.85 and 36.50 degrees north.
+In 2014, a study argued for a new dating of approximately 200 BC, based on identifying the start-up date on the Saros Dial, as the astronomical lunar month that began shortly after the new moon of 28 April 205 BC. According to this theory the Babylonian arithmetic style of prediction fits much better with the device's predictive models than the traditional Greek trigonometric style. A study by Iversen in 2017 reasons that the prototype for the device was from Rhodes, but that this particular model was modified for a client from Epirus in northwestern Greece; Iversen argues it was probably constructed no earlier than a generation before the shipwreck, a date supported by Jones in 2017.
+Further dives were undertaken in 2014 and 2015, in the hope of discovering more of the mechanism. A five-year programme of investigations began in 2014 and ended in October 2019, with a new five-year session starting in May 2020.
+In 2022, researchers proposed the mechanism's initial calibration date, not construction date, could have been 23 December 178 BC. Other experts propose 204 BC as a more likely calibration date. Machines with similar complexity did not appear again until the fourteenth century, with early examples being astronomical clocks of Richard of Wallingford and Giovanni de' Dondi.
+
+== Design ==
+The original mechanism apparently came out of the Mediterranean as a single encrusted piece. Soon afterwards it fractured into three major pieces. Other small pieces have broken off in the interim from cleaning and handling, and others were found on the sea floor by the Cousteau expedition. Other fragments may still be in storage, undiscovered since their initial recovery; Fragment F was discovered in that way in 2005. Of the 82 known fragments, seven are mechanically significant and contain the majority of the mechanism and inscriptions. Another 16 smaller parts contain fractional and incomplete inscriptions.
+
+Many of the smaller fragments that have been found contain nothing of apparent value, but a few have inscriptions on them. Fragment 19 contains significant back door inscriptions including one reading "... 76 years ..." which refers to the Callippic cycle. Other inscriptions seem to describe the function of the back dials. In addition to this important minor fragment, 15 further minor fragments have remnants of inscriptions on them.
+
+== Mechanics ==
+Information on the specific data obtained from the fragments is detailed in the supplement to the 2006 Nature article from Freeth et al.

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+Pappus of Alexandria (290 – c. 350 AD) stated that Archimedes had written a now lost manuscript on the construction of these devices titled On Sphere-Making. The surviving texts from ancient times describe many of his creations, some even containing simple drawings. One such device is his odometer, the exact model later used by the Romans to place their mile markers (described by Vitruvius, Heron of Alexandria and in the time of Emperor Commodus). The drawings in the text appeared functional, but attempts to build them as pictured had failed. When the gears pictured, which had square teeth, were replaced with gears of the type in the Antikythera mechanism, which were angled, the device was perfectly functional.
+If Cicero's account is correct, then this technology existed as early as the third century BC. Archimedes' device is also mentioned by later Roman era writers such as Lactantius (Divinarum Institutionum Libri VII), Claudian (In sphaeram Archimedes), and Proclus (Commentary on the first book of Euclid's Elements of Geometry) in the fourth and fifth centuries.
+Cicero also said that another such device was built "recently" by his friend Posidonius, "... each one of the revolutions of which brings about the same movement in the Sun and Moon and five wandering stars [planets] as is brought about each day and night in the heavens ..."
+It is unlikely that any one of these machines was the particular Antikythera mechanism found in the shipwreck since both the devices fabricated by Archimedes and mentioned by Cicero were located in Rome at least 30 years later than the estimated date of the shipwreck, and the third device was almost certainly in the hands of Posidonius by that date. The scientists who have reconstructed the Antikythera mechanism also agree that it was too sophisticated to have been a unique device.
+Other relatively complex metal devices are known from Roman Greece. For example, a bronze combination lock from the Augustan or Hadrianic period was unearthed in the Kerameikos. The device operated on a primitive form of mechanical logic: the central bolt was physically blocked from retracting until the notches of two independent rotary dials were correctly aligned. The device also included a simple concealed bypass mechanism.
+
+=== Eastern Mediterranean and others ===
+
+This evidence that the Antikythera mechanism was not unique adds support to the idea that there was an ancient Greek tradition of complex mechanical technology that was later, at least in part, transmitted to the Byzantine and Islamic worlds, where mechanical devices which were complex, albeit simpler than the Antikythera mechanism, were built during the Middle Ages. Fragments of a geared calendar attached to a sundial, from the fifth or sixth century Byzantine Empire, have been found; the calendar may have been used to assist in telling time. In the Islamic world, Banū Mūsā's Kitab al-Hiyal, or Book of Ingenious Devices, was commissioned by the Caliph of Baghdad in the early 9th century AD. This text described over a hundred mechanical devices, some of which may date back to ancient Greek texts preserved in monasteries. A geared calendar similar to the Byzantine device was described by the scientist al-Biruni around 1000, and a surviving 13th-century astrolabe also contains a similar clockwork device. It is possible that this medieval technology may have been transmitted to Europe and contributed to the development of mechanical clocks there.
+In the 11th century, Chinese polymath Su Song constructed a mechanical clock tower that told (among other measurements) the position of some stars and planets, which were shown on a mechanically rotated armillary sphere.
+
+== Popular culture and museum replicas ==

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+---
+title: "Antikythera mechanism"
+chunk: 12/12
+source: "https://en.wikipedia.org/wiki/Antikythera_mechanism"
+category: "reference"
+tags: "science, encyclopedia"
+date_saved: "2026-05-05T03:10:22.835554+00:00"
+instance: "kb-cron"
+---
+
+Several exhibitions have been staged worldwide, leading to the main "Antikythera shipwreck" exhibition at the National Archaeological Museum in Athens. As of 2012, the Antikythera mechanism was displayed as part of a temporary exhibition about the Antikythera shipwreck, accompanied by reconstructions made by Ioannis Theofanidis, Derek de Solla Price, Michael Wright, the Thessaloniki University and Dionysios Kriaris. Other reconstructions are on display at the American Computer Museum in Bozeman, Montana, at the Children's Museum of Manhattan in New York, at Astronomisch-Physikalisches Kabinett in Kassel, Germany, at the Archimedes Museum in Olympia, Greece, at the Kotsanas Museum of Ancient Greek Technology in Athens, at the Musée des Arts et Métiers in Paris and at the Western Australian Museum.
+The National Geographic documentary series Naked Science dedicated an episode to the Antikythera Mechanism entitled "Star Clock BC" that aired on 20 January 2011. A documentary, The World's First Computer, was produced in 2012 by the Antikythera mechanism researcher and film-maker Tony Freeth. In 2012, BBC Four aired The Two-Thousand-Year-Old Computer; it was also aired on 3 April 2013 in the United States on NOVA, the PBS science series, under the name Ancient Computer. It documents the discovery and 2005 investigation of the mechanism by the Antikythera Mechanism Research Project.
+A functioning Lego reconstruction of the Antikythera mechanism was built in 2010 by hobbyist Andy Carol, and featured in a short film produced by Small Mammal in 2011.
+On 17 May 2017, Google marked the 115th anniversary of the discovery with a Google Doodle.
+The YouTube channel Clickspring documents the creation of an Antikythera mechanism replica using the tools, techniques of machining and metallurgy, and materials that would have been available in ancient Greece, along with investigations into the possible technologies of the era.
+The film Indiana Jones and the Dial of Destiny (2023) features a plot around a fictionalized version of the mechanism (also referred to as Archimedes' Dial, the titular Dial of Destiny). In the film, the device was built by Archimedes as a temporal mapping system, and sought by a former Nazi scientist as a way to detect time portals in order to travel back in time and help Germany win World War II. A major plot point revolves around the fact that the device did not take continental drift into account as the theory was unknown in Archimedes' time.
+On 8 February 2024, a 10X scale replica of the mechanism was built, installed, and inaugurated at the University of Sonora in Hermosillo, Sonora, Mexico. With the name of Monumental Antikythera Mechanism for Hermosillo (MAMH), Dr. Alfonso performed the inauguration. Also attending were Durazo Montaño, Governor of Sonora and Dr. Maria Rita Plancarte Martinez, chancellor of the Universidad de Sonora, the ambassador of Greece, Nikolaos Koutrokois, and a delegation from the Embassy.
+In 2024, Finnish band Nightwish's album Yesterwynde included the track Antikythera Mechanism. The band also partnered with Finnish watch manufacturer POOK Watches to release a limited edition watch, with elements referencing the Antikythera Mechanism.
+
+== See also ==
+Ancient technology – Technological results from advances in engineering in ancient civilizations
+Archimedes Palimpsest – Greek parchment codex manuscript
+Astrarium – Timepiece and astronomical prediction device
+Automaton – Self-operating machine
+Baghdad Battery – Set of artifacts claimed to be a battery
+Ctesibius – 3rd-century BC Greek inventor and mathematician
+Out-of-place artifact – Artifacts that challenge historical chronology
+Reverse engineering – Process of extracting design information from anything artificial
+
+== References ==
+
+== Further reading ==
+
+== External links ==
+
+Bragg, Melvyn (November 2024). "The Antikythera mechanism". BBC, In Our Time programme.
+New Antikythera mechanism analysis challenges century-old assumption - Arstechnica - Jennifer Ouellette - 7/10/2024
+Weibel, Thomas. "The Antikythera Mechanism". Animated model of the Antikythera mechanism in virtual reality.
+Asimakopoulos, Fivos. "3D model simulation". Manos Roumeliotis's Simulation and Animation of the Antikythera Mechanism page. The Antikythera Mechanism Research Project.
+The Antikythera Mechanism Research Project. "Videos". YouTube. Retrieved 24 July 2017.
+"The Antikythera Mechanism Exhibitions". National Hellenic Research Foundation. Archived from the original on 23 April 2012.
+YAAS – A 3D interactive virtual reality simulator in VRML Archived 5 March 2024 at the Wayback Machine
+Wright, M.; Vicentini, M. (25 August 2009). "Virtual Reconstruction of the Antikythera Mechanism". Heritage Key. Archived from the original on 7 November 2021 – via YouTube.
+Metapage with links December 2021. at antikythera.org
+Bronze replica 3D engineering manufacturing drawings and operating manual

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+---
+title: "Antikythera mechanism"
+chunk: 3/12
+source: "https://en.wikipedia.org/wiki/Antikythera_mechanism"
+category: "reference"
+tags: "science, encyclopedia"
+date_saved: "2026-05-05T03:10:22.835554+00:00"
+instance: "kb-cron"
+---
+
+=== Operation ===
+On the front face of the mechanism, there is a fixed ring dial representing the ecliptic, the twelve zodiacal signs marked off with equal 30-degree sectors. This matched with the Babylonian custom of assigning one twelfth of the ecliptic to each zodiac sign equally, even though the constellation boundaries were variable. Outside that dial is another ring which is rotatable, marked off with the months and days of the Sothic Egyptian calendar, twelve months of 30 days plus five intercalary days. The months are marked with the Egyptian names for the months transcribed into the Greek alphabet. The first task is to rotate the Egyptian calendar ring to match the current zodiac points. The Egyptian calendar ignored leap days, so it advanced through a full zodiac sign in about 120 years.
+The mechanism was operated by turning a small hand crank (now lost) which was linked via a crown gear to the largest gear, the four-spoked gear visible on the front of fragment A, gear b1. This moved the date pointer on the front dial, which would be set to the correct Egyptian calendar day. The year is not selectable, so it is necessary to know the year currently set, or by looking up the cycles indicated by the various calendar cycle indicators on the back in the Babylonian ephemeris tables for the day of the year currently set, since most of the calendar cycles are not synchronous with the year. The crank moves the date pointer about 78 days per full rotation, so hitting a particular day on the dial would be easily possible if the mechanism were in good working condition. The action of turning the hand crank would also cause all interlocked gears within the mechanism to rotate, resulting in the simultaneous calculation of the position of the Sun and Moon, the moon phase, eclipse, and calendar cycles, and perhaps the locations of planets.
+The operator also had to be aware of the position of the spiral dial pointers on the two large dials on the back. The pointer had a "follower" that tracked the spiral incisions in the metal as the dials incorporated four and five full rotations of the pointers. When a pointer reached the terminal month location at either end of the spiral, the pointer's follower had to be manually moved to the other end of the spiral before proceeding further.
+
+=== Faces ===
+
+==== Front face ====
+The front dial has two concentric circular scales. The inner scale marks the Greek signs of the zodiac, with division in degrees. The outer scale, which is a movable ring that sits flush with the surface and runs in a channel, is marked off with what appear to be days and has a series of corresponding holes beneath the ring in the channel.
+Since the discovery of the mechanism more than a century ago, this outer ring has been presumed to represent a 365-day Egyptian solar calendar, but research (Budiselic, et al., 2020) challenged this presumption and provided direct statistical evidence there are 354 intervals, suggesting a lunar calendar. Since this initial discovery, two research teams, using different methods, independently calculated the interval count. Woan and Bayley calculate 354–355 intervals using two different methods, confirming with higher accuracy the Budiselic et al. findings and noting that "365 holes is not plausible". Malin and Dickens' best estimate is 352.3±1.5 and concluded that the number of holes (N) "has to be integral and the SE (standard error) of 1.5 indicates that there is less than a 5% probability that N is not one of the six values in the range 350 to 355. The chances of N being as high as 365 are less than 1 in 10,000. While other contenders cannot be ruled out, of the two values that have been proposed for N on astronomical grounds, that of Budiselic et al. (354) is by far the more likely."
+If one supports the 365 day presumption, it is recognized the mechanism predates the Julian calendar reform, but the Sothic and Callippic cycles had already pointed to a ⁠365+1/4⁠ day solar year, as seen in Ptolemy III's attempted calendar reform of 238 BC. The dials are not believed to reflect his proposed leap day (Epag. 6), but the outer calendar dial may be moved against the inner dial to compensate for the effect of the extra quarter-day in the solar year by turning the scale backward one day every four years.
+If one is in favour of the 354 day evidence, the most likely interpretation is that the ring is a manifestation of a 354-day lunar calendar. Given the era of the mechanism's presumed construction and the presence of Egyptian month names, it is possibly the first example of the Egyptian civil-based lunar calendar proposed by Richard Anthony Parker in 1950. The lunar calendar's purpose was to serve as a day-to-day indicator of successive lunations, and would also have assisted with the interpretation of the lunar phase pointer, and the Metonic and Saros dials. Undiscovered gearing, synchronous with the rest of the Metonic gearing of the mechanism, is implied to drive a pointer around this scale. Movement and registration of the ring relative to the underlying holes served to facilitate both a 1-in-76-year Callippic cycle correction, as well as convenient lunisolar intercalation.
+The dial also marks the position of the Sun on the ecliptic, corresponding to the current date in the year. The orbits of the Moon and the five planets known to the Greeks are close enough to the ecliptic to make it a convenient reference for defining their positions as well.
+The following three Egyptian months are inscribed in Greek letters on the surviving pieces of the outer ring:

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+---
+title: "Antikythera mechanism"
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+date_saved: "2026-05-05T03:10:22.835554+00:00"
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+---
+
+ΠΑΧΩΝ (Pashons)
+ΠΑΥΝΙ (Payni)
+ΕΠΙΦΙ (Epiphi)
+The other months have been reconstructed; some reconstructions of the mechanism omit the five days of the Egyptian intercalary month. The Zodiac dial contains Greek inscriptions of the members of the zodiac, which is believed to be adapted to the tropical month version rather than the sidereal:
+
+ΚΡΙΟΣ (Krios [Ram], Aries)
+ΤΑΥΡΟΣ (Tauros [Bull], Taurus)
+ΔΙΔΥΜΟΙ (Didymoi [Twins], Gemini)
+ΚΑΡΚΙΝΟΣ (Karkinos [Crab], Cancer)
+ΛΕΩΝ (Leon [Lion], Leo)
+ΠΑΡΘΕΝΟΣ (Parthenos [Maiden], Virgo)
+ΧΗΛΑΙ (Chelai [Scorpio's Claw or Zygos], Libra)
+ΣΚΟΡΠΙΟΣ (Skorpios [Scorpion], Scorpio)
+ΤΟΞΟΤΗΣ (Toxotes [Archer], Sagittarius)
+ΑΙΓΟΚΕΡΩΣ (Aigokeros [Goat-horned], Capricorn)
+ΥΔΡΟΧΟΟΣ (Hydrokhoos [Water carrier], Aquarius)
+ΙΧΘΥΕΣ (Ichthyes [Fish], Pisces)
+Also on the zodiac dial are single characters at specific points (see reconstruction at ref). They are keyed to a parapegma, a precursor of the modern day almanac inscribed on the front face above and beneath the dials. They mark the locations of longitudes on the ecliptic for specific stars. The parapegma above the dials reads (square brackets indicate inferred text):
+
+The parapegma beneath the dials reads:
+
+At least two pointers indicated positions of bodies upon the ecliptic. A lunar pointer indicated the position of the Moon, and a mean Sun pointer was shown, perhaps doubling as the current date pointer. The Moon position was not a simple mean Moon indicator which would indicate movement uniformly around a circular orbit; rather, it approximated the acceleration and deceleration of the Moon's elliptical orbit, through the earliest extant use of epicyclic gearing.
+It also tracked the precession of the Moon's elliptical orbit around the ecliptic in an 8.88 year cycle. The mean Sun position is, by definition, the current date. It is speculated that since significant effort was taken to ensure the position of the Moon was correct, there was likely to have also been a "true sun" pointer in addition to the mean Sun pointer, to track the elliptical anomaly of the Sun (the orbit of Earth around the Sun), but there is no evidence of it among the fragments found. Similarly, neither is there the evidence of planetary orbit pointers for the five planets known to the Greeks among the fragments. But see Proposed gear schemes below.
+Mechanical engineer Michael Wright demonstrated there was a mechanism to supply the lunar phase in addition to the position. The indicator was a small ball embedded in the lunar pointer, half-white and half-black, which rotated to show the phase (new, first quarter, half, third quarter, full, and back). The data to support this function is available given the Sun and Moon positions as angular rotations; essentially, it is the angle between the two, translated into the rotation of the ball. It requires a differential gear, a gearing arrangement that sums or differences two angular inputs.
+
+==== Rear face ====
+
+In 2008, scientists reported new findings in Nature showing the mechanism not only tracked the Metonic calendar and predicted solar eclipses, but also calculated the timing of panhellenic athletic games, such as the ancient Olympic Games. Inscriptions on the instrument closely match the names of the months that are used on calendars from Epirus in northwestern Greece and with the island of Corfu, which in antiquity was known as Corcyra.
+On the back of the mechanism, there are five dials: the two large displays, the Metonic and the Saros, and three smaller indicators, the so-called Olympiad Dial, which has been renamed the Games dial as it did not track Olympiad years (the four-year cycle it tracks most closely is the Halieiad), the Callippic, and the exeligmos.
+The Metonic dial is the main upper dial on the rear of the mechanism. The Metonic cycle, defined in several physical units, is 235 synodic months, which is very close (to within less than 13 one-millionths) to 19 tropical years. It is therefore a convenient interval over which to convert between lunar and solar calendars. The Metonic dial covers 235 months in five rotations of the dial, following a spiral track with a follower on the pointer that keeps track of the layer of the spiral. The pointer points to the synodic month, counted from new moon to new moon, and the cell contains the Corinthian month names.
+
+ΦΟΙΝΙΚΑΙΟΣ (Phoinikaios)
+ΚΡΑΝΕΙΟΣ (Kraneios)
+ΛΑΝΟΤΡΟΠΙΟΣ (Lanotropios)
+ΜΑΧΑΝΕΥΣ (Machaneus, "mechanic", referring to Zeus the inventor)
+ΔΩΔΕΚΑΤΕΥΣ (Dodekateus)
+ΕΥΚΛΕΙΟΣ (Eukleios)
+ΑΡΤΕΜΙΣΙΟΣ (Artemisios)
+ΨΥΔΡΕΥΣ (Psydreus)
+ΓΑΜΕΙΛΙΟΣ (Gameilios)
+ΑΓΡΙΑΝΙΟΣ (Agrianios)
+ΠΑΝΑΜΟΣ (Panamos)
+ΑΠΕΛΛΑΙΟΣ (Apellaios)
+Thus, setting the correct solar time (in days) on the front panel indicates the current lunar month on the back panel, with resolution to within a week or so.
+Based on the fact that the calendar month names are consistent with all the evidence of the Epirote calendar and that the Games dial mentions the very minor Naa games of Dodona (in Epirus), it has been argued that the calendar on the mechanism is likely to be the Epirote calendar, and that this calendar was probably adopted from a Corinthian colony in Epirus, possibly Ambracia. It has been argued that the first month of the calendar, Phoinikaios, was ideally the month in which the autumn equinox fell, and that the start-up date of the calendar began shortly after the astronomical new moon of 23 August 205 BC.
+The Games dial is the right secondary upper dial; it is the only pointer on the instrument that travels in an anticlockwise direction as time advances. The dial is divided into four sectors, each of which is inscribed with a year indicator and the name of two Panhellenic Games: the "crown" games of Isthmia, Olympia, Nemea, and Pythia; and two lesser games: Naa (held at Dodona) and the Halieia of Rhodes. The inscriptions on each one of the four divisions are:

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+---
+title: "Antikythera mechanism"
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+source: "https://en.wikipedia.org/wiki/Antikythera_mechanism"
+category: "reference"
+tags: "science, encyclopedia"
+date_saved: "2026-05-05T03:10:22.835554+00:00"
+instance: "kb-cron"
+---
+
+The Saros dial is the main lower spiral dial on the rear of the mechanism. The Saros cycle is 18 years and 11+1⁄3 days long (6585.333... days), which is very close to 223 synodic months (6585.3211 days). It is defined as the cycle of repetition of the positions required to cause solar and lunar eclipses, and therefore, it could be used to predict them—not only the month, but the day and time of day. The cycle is approximately 8 hours longer than an integer number of days. Translated into global spin, that means an eclipse occurs not only eight hours later, but one-third of a rotation farther to the west. Glyphs in 51 of the 223 synodic month cells of the dial specify the occurrence of 38 lunar and 27 solar eclipses. Some of the abbreviations in the glyphs read:
+
+Σ = ΣΕΛΗΝΗ ("Selene", Moon)
+Η = ΗΛΙΟΣ ("Helios", Sun)
+H\M = ΗΜΕΡΑΣ ("Hemeras", of the day)
+ω\ρ = ωρα ("hora", hour)
+N\Y = ΝΥΚΤΟΣ ("Nuktos", of the night)
+The glyphs show whether the designated eclipse is solar or lunar, and give the day of the month and hour. Solar eclipses may not be visible at any given point, and lunar eclipses are visible only if the Moon is above the horizon at the appointed hour. In addition, the inner lines at the cardinal points of the Saros dial indicate the start of a new full moon cycle. Based on the distribution of the times of the eclipses, it has been argued the start-up date of the Saros dial was shortly after the astronomical new moon of 28 April 205 BC.
+The Exeligmos dial is the secondary lower dial on the rear of the mechanism. The exeligmos cycle is a 54-year triple Saros cycle that is 19,756 days long. Since the length of the Saros cycle is to a third of a day (namely, 6,585 days plus 8 hours), a full exeligmos cycle returns the counting to an integral number of days, as reflected in the inscriptions. The labels on its three divisions are:
+
+Blank or o ? (representing the number zero, assumed, not yet observed)
+H (number 8) means add 8 hours to the time mentioned in the display
+Iϛ (number 16) means add 16 hours to the time mentioned in the display
+Thus the dial pointer indicates how many hours must be added to the glyph times of the Saros dial in order to calculate the exact eclipse times.
+
+=== Doors ===
+
+The mechanism has a wooden casing with a front and a back door, both containing inscriptions. The back door appears to be the 'instruction manual'. On fragment 19, it is written "76 years, 19 years" representing the Callippic and Metonic cycles. Also written is "223" for the Saros cycle. On fragment E, it is written "on the spiral subdivisions 235" referring to the Metonic dial.

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+---
+title: "Antikythera mechanism"
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+tags: "science, encyclopedia"
+date_saved: "2026-05-05T03:10:22.835554+00:00"
+instance: "kb-cron"
+---
+
+=== Gearing ===
+The mechanism is remarkable for the level of miniaturisation and the complexity of its parts, which is comparable to that of 14th-century astronomical clocks. It has at least 30 gears, although mechanism expert Michael Wright has suggested the Greeks of this period were capable of implementing a system with many more gears.
+There is debate as to whether the mechanism had indicators for all five of the planets known to the ancient Greeks. No gearing for such a planetary display survives and all gears are accounted for—with the exception of one 63-toothed gear (r1) otherwise unaccounted for in fragment D.
+Fragment D is a small quasi-circular constriction that, according to Xenophon Moussas, has a gear inside a somewhat larger hollow gear. The inner gear moves inside the outer gear reproducing an epicyclical motion that, with a pointer, gives the position of planet Jupiter. The inner gear is numbered 45, "ME" in Greek, and the same number is written on two surfaces of this small cylindrical box.
+The purpose of the front face was to position astronomical bodies with respect to the celestial sphere along the ecliptic, in reference to the observer's position on the Earth. That is irrelevant to the question of whether that position was computed using a heliocentric or geocentric view of the Solar System; either computational method should, and does, result in the same position (ignoring ellipticity), within the error factors of the mechanism. The epicyclic Solar System of Ptolemy (c. 100 AD–c. 170 AD)—hundreds of years after the apparent construction date of the mechanism—carried forward with more epicycles, and was more accurate predicting the positions of planets than the view of Copernicus (1473–1543), until Kepler (1571–1630) introduced the possibility that orbits are ellipses.
+Evans et al. suggest that to display the mean positions of the five classical planets would require only 17 further gears that could be positioned in front of the large driving gear and indicated using individual circular dials on the face.
+Freeth and Jones modelled and published details of a version using gear trains mechanically similar to the lunar anomaly system, allowing for indication of the positions of the planets, as well as synthesis of the Sun anomaly. Their system, they claim, is more authentic than Wright's model, as it uses the known skills of the Greeks and does not add excessive complexity or internal stresses to the machine.
+The gear teeth were in the form of equilateral triangles with an average circular pitch of 1.6 mm, an average wheel thickness of 1.4 mm and an average air gap between gears of 1.2 mm. The teeth were probably created from a blank bronze round using hand tools; this is evident because not all of them are even. Due to advances in imaging and X-ray technology, it is now possible to know the precise number of teeth and size of the gears within the located fragments. Thus the basic operation of the device is no longer a mystery and has been replicated accurately. The major unknown remains the question of the presence and nature of any planet indicators.
+A table of the gears, their teeth, and the expected and computed rotations of important gears follows. The gear functions come from Freeth et al. (2008) and for the lower half of the table from Freeth et al. (2012). The computed values start with 1 year per revolution for the b1 gear, and the remainder are computed directly from gear teeth ratios. The gears marked with an asterisk (*) are missing, or have predecessors missing, from the known mechanism; these gears have been calculated with reasonable gear teeth counts. (Lengths in days are calculated assuming the year to be 365.2425 days.)
+
+Table notes:
+
+There are several gear ratios for each planet that result in close matches to the correct values for synodic periods of the planets and the Sun. Those chosen above seem accurate, with reasonable tooth counts, but the specific gears actually used are unknown.
+
+==== Known gear scheme ====

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+title: "Antikythera mechanism"
+chunk: 7/12
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+tags: "science, encyclopedia"
+date_saved: "2026-05-05T03:10:22.835554+00:00"
+instance: "kb-cron"
+---
+
+It is very probable there were planetary dials, as the complicated motions and periodicities of all planets are mentioned in the manual of the mechanism. The exact position and mechanisms for the gears of the planets is unknown. There is no coaxial system except for the Moon. Fragment D that is an epicycloidal system, is considered as a planetary gear for Jupiter (Moussas, 2011, 2012, 2014) or a gear for the motion of the Sun (University of Thessaloniki group).
+The Sun gear is operated from the hand-operated crank (connected to gear a1, driving the large four-spoked mean Sun gear, b1) and in turn drives the rest of the gear sets. The Sun gear is b1/b2 and b2 has 64 teeth. It directly drives the date/mean sun pointer (there may have been a second, "true sun" pointer that displayed the Sun's elliptical anomaly; it is discussed below in the Freeth reconstruction). In this discussion, reference is to modelled rotational period of various pointers and indicators; they all assume the input rotation of the b1 gear of 360 degrees, corresponding with one tropical year, and are computed solely on the basis of the gear ratios of the gears named.
+The Moon train starts with gear b1 and proceeds through c1, c2, d1, d2, e2, e5, k1, k2, e6, e1, and b3 to the Moon pointer on the front face. The gears k1 and k2 form an epicyclic gear system; they are an identical pair of gears that do not mesh, but rather, they operate face-to-face, with a short pin on k1 inserted into a slot in k2. The two gears have different centres of rotation, so the pin must move back and forth in the slot. That increases and decreases the radius at which k2 is driven, also necessarily varying its angular velocity (presuming the velocity of k1 is even) faster in some parts of the rotation than others. Over an entire revolution the average velocities are the same, but the fast-slow variation models the effects of the elliptical orbit of the Moon, in consequence of Kepler's second and third laws. The modelled rotational period of the Moon pointer (averaged over a year) is 27.321 days, compared to the modern length of a lunar sidereal month of 27.321661 days. The pin/slot driving of the k1/k2 gears varies the displacement over a year's time, and the mounting of those two gears on the e3 gear supplies a precessional advancement to the ellipticity modelling with a period of 8.8826 years, compared with the current value of precession period of the moon of 8.85 years.
+The system also models the phases of the Moon. The Moon pointer holds a shaft along its length, on which is mounted a small gear named r, which meshes to the Sun pointer at B0 (the connection between B0 and the rest of B is not visible in the original mechanism, so whether b0 is the current date/mean Sun pointer or a hypothetical true Sun pointer is unknown). The gear rides around the dial with the Moon, but is also geared to the Sun—the effect is to perform a differential gear operation, so the gear turns at the synodic month period, measuring in effect, the angle of the difference between the Sun and Moon pointers. The gear drives a small ball that appears through an opening in the Moon pointer's face, painted longitudinally half white and half black, displaying the phases pictorially. It turns with a modelled rotational period of 29.53 days; the modern value for the synodic month is 29.530589 days.
+The Metonic train is driven by the drive train b1, b2, l1, l2, m1, m2, and n1, which is connected to the pointer. The modelled rotational period of the pointer is the length of the 6,939.5 days (over the whole five-rotation spiral), while the modern value for the Metonic cycle is 6,939.69 days.
+The Olympiad train is driven by b1, b2, l1, l2, m1, m2, n1, n2, and o1, which mounts the pointer. It has a computed modelled rotational period of exactly four years, as expected. It is the only pointer on the mechanism that rotates anticlockwise; all of the others rotate clockwise.
+The Callippic train is driven by b1, b2, l1, l2, m1, m2, n1, n3, p1, p2, and q1, which mounts the pointer. It has a computed modelled rotational period of 27,758 days, while the modern value is 27,758.8 days.
+The Saros train is driven by b1, b2, l1, l2, m1, m3, e3, e4, f1, f2, and g1, which mounts the pointer. The modelled rotational period of the Saros pointer is 1,646.3 days (in four rotations along the spiral pointer track); the modern value is 1,646.33 days.
+The Exeligmos train is driven by b1, b2, l1, l2, m1, m3, e3, e4, f1, f2, g1, g2, h1, h2, and i1, which mounts the pointer. The modelled rotational period of the exeligmos pointer is 19,756 days; the modern value is 19,755.96 days.
+It appears gears m3, n1-3, p1-2, and q1 did not survive in the wreckage. The functions of the pointers were deduced from the remains of the dials on the back face, and reasonable, appropriate gearage to fulfill the functions was proposed and is generally accepted.
+
+== Reconstruction efforts ==

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+---
+title: "Antikythera mechanism"
+chunk: 8/12
+source: "https://en.wikipedia.org/wiki/Antikythera_mechanism"
+category: "reference"
+tags: "science, encyclopedia"
+date_saved: "2026-05-05T03:10:22.835554+00:00"
+instance: "kb-cron"
+---
+
+=== Proposed gear schemes ===
+Because of the large space between the mean Sun gear and the front of the case and the size of and mechanical features on the mean Sun gear, it is very likely that the mechanism contained further gearing that either has been lost in or subsequent to the shipwreck, or was removed before being loaded onto the ship. This lack of evidence and nature of the front part of the mechanism has led to attempts to emulate what the Ancient Greeks would have done and because of the lack of evidence, many solutions have been put forward over the years. But as progress has been made on analyzing the internal structures and deciphering the inscriptions, earlier models have been ruled out and better models developed.
+
+Derek J. de Solla Price built a simple model in the 1970s.
+In 2002 Michael Wright designed and built the first workable model with the known mechanism and his emulation of a potential planetarium system. He suggested that along with the lunar anomaly, adjustments would have been made for the deeper, more basic solar anomaly (known as the "first anomaly"). He included pointers for this "true sun", Mercury, Venus, Mars, Jupiter, and Saturn, in addition to the known "mean sun" (current time) and lunar pointers.
+Evans, Carman, and Thorndike published a solution in 2010 with significant differences from Wright's. Their proposal centred on what they observed as irregular spacing of the inscriptions on the front dial face, which to them seemed to indicate an off-centre sun indicator arrangement; this would simplify the mechanism by removing the need to simulate the solar anomaly. They suggested that rather than accurate planetary indication (rendered impossible by the offset inscriptions) there would be simple dials for each individual planet, showing information such as key events in the cycle of planet, initial and final appearances in the night sky, and apparent direction changes. This system would lead to a much simplified gear system, with much reduced forces and complexity, as compared to Wright's model.
+Their proposal used simple meshed gear trains and accounted for the previously unexplained 63 toothed gear in fragment D. They proposed two face plate layouts, one with evenly spaced dials, and another with a gap in the top of the face, to account for criticism that they did not use the apparent fixtures on the b1 gear. They proposed that rather than bearings and pillars for gears and axles, they simply held weather and seasonal icons to be displayed through a window. In a paper published in 2012, Carman, Thorndike, and Evans also proposed a system of epicyclic gearing with pin and slot followers.
+Freeth and Jones published a proposal in 2012. They proposed a compact and feasible solution to the question of planetary indication. They also propose indicating the solar anomaly (that is, the sun's apparent position in the zodiac dial) on a separate pointer from the date pointer, which indicates the mean position of the Sun, as well as the date on the month dial. If the two dials are synchronised correctly, their front panel display is essentially the same as Wright's. Unlike Wright's model however, this model has not been built physically, and is only a 3-D computer model.

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+---
+title: "Antikythera mechanism"
+chunk: 9/12
+source: "https://en.wikipedia.org/wiki/Antikythera_mechanism"
+category: "reference"
+tags: "science, encyclopedia"
+date_saved: "2026-05-05T03:10:22.835554+00:00"
+instance: "kb-cron"
+---
+
+The system to synthesise the solar anomaly is very similar to that used in Wright's proposal: three gears, one fixed in the centre of the b1 gear and attached to the Sun spindle, the second fixed on one of the spokes (in their proposal the one on the bottom left) acting as an idle gear, and the final positioned next to that one; the final gear is fitted with an offset pin and, over said pin, an arm with a slot that in turn, is attached to the sun spindle, inducing anomaly as the mean Sun wheel turns.
+The inferior planet mechanism includes the Sun (treated as a planet in this context), Mercury, and Venus. For each of the three systems, there is an epicyclic gear whose axis is mounted on b1, thus the basic frequency is the Earth year (as it is, in truth, for epicyclic motion in the Sun and all the planets—excepting only the Moon). Each meshes with a gear grounded to the mechanism frame. Each has a pin mounted, potentially on an extension of one side of the gear that enlarges the gear, but doesn't interfere with the teeth; in some cases, the needed distance between the gear's centre and the pin is farther than the radius of the gear itself. A bar with a slot along its length extends from the pin toward the appropriate coaxial tube, at whose other end is the object pointer, out in front of the front dials. The bars could have been full gears, although there is no need for the waste of metal, since the only working part is the slot. Also, using the bars avoids interference between the three mechanisms, each of which are set on one of the four spokes of b1. Thus there is one new grounded gear (one was identified in the wreckage, and the second is shared by two of the planets), one gear used to reverse the direction of the sun anomaly, three epicyclic gears and three bars/coaxial tubes/pointers, which would qualify as another gear each: five gears and three slotted bars in all.
+The superior planet systems—Mars, Jupiter, and Saturn—all follow the same general principle of the lunar anomaly mechanism. Similar to the inferior systems, each has a gear whose centre pivot is on an extension of b1, and which meshes with a grounded gear. It presents a pin and a centre pivot for the epicyclic gear which has a slot for the pin, and which meshes with a gear fixed to a coaxial tube and thence to the pointer. Each of the three mechanisms can fit within a quadrant of the b1 extension, and they are thus all on a single plane parallel with the front dial plate. Each one uses a ground gear, a driving gear, a driven gear, and a gear/coaxial tube/pointer, thus, twelve gears additional in all.
+In total, there are eight coaxial spindles of various nested sizes to transfer the rotations in the mechanism to the eight pointers. So in all, there are 30 original gears, seven gears added to complete calendar functionality, 17 gears and three slotted bars to support the six new pointers, for a grand total of 54 gears, three bars, and eight pointers in Freeth and Jones' design.
+On the visual representation Freeth provides, the pointers on the front zodiac dial have small, round identifying stones. He refers to a quote from an ancient papyrus:
+
+...a voice comes to you speaking. Let the stars be set upon the board in accordance with [their] nature except for the Sun and Moon. And let the Sun be golden, the Moon silver, Kronos [Saturn] of obsidian, Ares [Mars] of reddish onyx, Aphrodite [Venus] lapis lazuli veined with gold, Hermes [Mercury] turquoise; let Zeus [Jupiter] be of (whitish?) stone, crystalline (?)...
+However, more recent discoveries and research have shown that the above models are not correct. In 2016, the numbers 462 and 442 were found in computed tomography scans of the inscriptions dealing with Venus and Saturn, respectively. These relate to the synodic cycles of these planets, and indicated that the mechanism was more accurate than previously thought.
+In 2018, based on the CT scans, the Antikythera Mechanism Research Project proposed changes in gearing and produced mechanical parts based on this.
+In March 2021, the Antikythera Research Team at University College London, led by Freeth, published a new proposed reconstruction of the entire Antikythera Mechanism. They were able to find gears that could be shared among the gear-trains for the different planets, by using rational approximations for the synodic cycles which have small prime factors, with the factors 7 and 17 being used for more than one planet. They conclude that none of the previous models "are at all compatible with all the currently known data", but their model is compatible with it.
+Freeth has directed a video explaining the discovery of the synodic cycle periods and the conclusions about how the mechanism worked.
+In 2025, one research team concluded that manufacture error in the original mechanism's gears is too great for the mechanism to have ever worked; they emphasized that the scans they used could be incorrect about the extent of imperfections.
+
+=== Accuracy ===
+Investigations by Freeth and Jones reveal their simulated mechanism is inaccurate. The Mars pointer is up to 38° wrong in some instances (these inaccuracies occur at the nodal points of Mars' retrograde motion, and the error recedes at other locations in the orbit). This is not due to inaccuracies in gearing ratios in the mechanism, but inadequacies in the Greek theory of planetary movements. The accuracy could not have been improved until c. 160 AD when Ptolemy published his Almagest (particularly by adding the concept of the equant to his theory), then much later by the introduction of Kepler's laws of planetary motion in 1609 and 1619.

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+---
+title: "Antikythera mechanism"
+chunk: 10/12
+source: "https://en.wikipedia.org/wiki/Antikythera_mechanism"
+category: "reference"
+tags: "science, encyclopedia"
+date_saved: "2026-05-05T03:10:22.835554+00:00"
+instance: "kb-cron"
+---
+
+In short, the Antikythera Mechanism was a machine designed to predict celestial phenomena according to the sophisticated astronomical theories current in its day, the sole witness to a lost history of brilliant engineering, a conception of pure genius, one of the great wonders of the ancient world—but it didn't really work very well!
+In addition to theoretical accuracy, there is the issue of mechanical accuracy. Freeth and Jones note that the inevitable "looseness" in the mechanism due to the hand-built gears, with their triangular teeth and the frictions between gears, and in bearing surfaces, probably would have swamped the finer solar and lunar correction mechanisms built into it:
+
+Though the engineering was remarkable for its era, recent research indicates that its design conception exceeded the engineering precision of its manufacture by a wide margin—with considerable cumulative inaccuracies in the gear trains, which would have cancelled out many of the subtle anomalies built into its design.
+While the device may have struggled with inaccuracies, due to the triangular teeth being hand-made, the calculations used and technology implemented to create the elliptical paths of the planets and retrograde motion of the Moon and Mars, by using a clockwork-type gear train with the addition of a pin-and-slot epicyclic mechanism, predated that of the first known clocks found in antiquity in medieval Europe, by more than 1000 years. Archimedes' development of the approximate value of pi and his theory of centres of gravity, along with the steps he made towards developing the calculus, suggest the Greeks had enough mathematical knowledge beyond that of Babylonian algebra, to model the elliptical nature of planetary motion.
+
+Of special delight to physicists, the Moon mechanism uses a special train of bronze gears, two of them linked with a slightly offset axis, to indicate the position and phase of the moon. As is known today from Kepler's laws of planetary motion, the moon travels at different speeds as it orbits the Earth, and this speed differential is modelled by the Antikythera Mechanism, even though the Ancient Greeks were not aware of the actual elliptical shape of the orbit.
+
+== Similar devices in ancient literature ==
+The level of refinement of the mechanism indicates that the device was not unique, and possibly required expertise built over several generations. However, such artefacts were commonly melted down for the value of the bronze and rarely survive to the present day.
+
+=== Roman world ===
+Cicero's De re publica (54–51 BC), a first century BC philosophical dialogue, mentions two machines that some modern authors consider as some kind of planetarium or orrery, predicting the movements of the Sun, the Moon, and the five planets known at that time. They were both built by Archimedes and brought to Rome by the Roman general Marcus Claudius Marcellus after the death of Archimedes at the siege of Syracuse in 212 BC. Marcellus had great respect for Archimedes and one of these machines was the only item he kept from the siege (the second was placed in the Temple of Virtue). The device was kept as a family heirloom, and Cicero has Philus (one of the participants in a conversation that Cicero imagined had taken place in a villa belonging to Scipio Aemilianus in the year 129 BC) saying that Gaius Sulpicius Gallus (consul with Marcellus's nephew in 166 BC, and credited by Pliny the Elder as the first Roman to have written a book explaining solar and lunar eclipses) gave both a "learned explanation" and a working demonstration of the device.
+
+I had often heard this celestial globe or sphere mentioned on account of the great fame of Archimedes. Its appearance, however, did not seem to me particularly striking. There is another, more elegant in form, and more generally known, moulded by the same Archimedes, and deposited by the same Marcellus, in the Temple of Virtue at Rome. But as soon as Gallus had begun to explain, by his sublime science, the composition of this machine, I felt that the Sicilian geometrician must have possessed a genius superior to any thing we usually conceive to belong to our nature. Gallus assured us, that the solid and compact globe, was a very ancient invention, and that the first model of it had been presented by Thales of Miletus. That afterwards Eudoxus of Cnidus, a disciple of Plato, had traced on its surface the stars that appear in the sky, and that many years subsequent, borrowing from Eudoxus this beautiful design and representation, Aratus had illustrated them in his verses, not by any science of astronomy, but the ornament of poetic description. He added, that the figure of the sphere, which displayed the motions of the Sun and Moon, and the five planets, or wandering stars, could not be represented by the primitive solid globe. And that in this, the invention of Archimedes was admirable, because he had calculated how a single revolution should maintain unequal and diversified progressions in dissimilar motions.
+When Gallus moved this globe, it showed the relationship of the Moon with the Sun, and there were exactly the same number of turns on the bronze device as the number of days in the real globe of the sky. Thus it showed the same eclipse of the Sun as in the globe [of the sky], as well as showing the Moon entering the area of the Earth's shadow when the Sun is in line ... [missing text] [i.e. It showed both solar and lunar eclipses.]

data/en.wikipedia.org/wiki/History_and_philosophy_of_science-0.md

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+---
+title: "History and philosophy of science"
+chunk: 1/1
+source: "https://en.wikipedia.org/wiki/History_and_philosophy_of_science"
+category: "reference"
+tags: "science, encyclopedia"
+date_saved: "2026-05-05T03:10:14.472676+00:00"
+instance: "kb-cron"
+---
+
+The history and philosophy of science (HPS) is an academic discipline that encompasses the philosophy of science and the history of science. Although many scholars in the field are trained primarily as either historians or as philosophers, there are degree-granting departments of HPS at several prominent universities. Though philosophy of science and history of science are their own disciplines, history and philosophy of science is a discipline in its own right.
+Philosophy of science is a branch of philosophy concerned with the foundations, methods, and implications of science. The central questions of this study concern what qualifies as science, the reliability of scientific theories, and the ultimate purpose of science. This discipline overlaps with metaphysics/ontology and epistemology, for example, when it explores the relationship between science and truth. Philosophy of science focuses on metaphysical, epistemic and semantic aspects of science. Ethical issues such as bioethics and scientific misconduct are often considered ethics or science studies rather than philosophy of science.
+There is no consensus among philosophers about many of the central problems concerned with the philosophy of science, including whether science can reveal the truth about unobservable things and whether scientific reasoning can be justified at all. In addition to these general questions about science as a whole, philosophers of science consider problems that apply to particular sciences (such as astronomy, biology, chemistry, Earth science, or physics). Some philosophers of science also use contemporary results in science to reach conclusions about philosophy itself.
+
+
+== History ==
+One origin of the unified discipline is the historical approach to the discipline of the philosophy of science. This hybrid approach is reflected in the career of Thomas Kuhn. His first permanent appointment, at the University of California, Berkeley, was to a position advertised by the philosophy department, but he also taught courses from the history department. When he was promoted to full professor in the history department only, Kuhn was offended at the philosophers' rejection because "I sure as hell wanted to be there, and it was my philosophy students who were working with me, not on philosophy but on history, were nevertheless my more important students". This attitude is also reflected in his historicist approach, as outlined in Kuhn's seminal Structure of Scientific Revolutions (1962, 2nd ed. 1970), wherein philosophical questions about scientific theories and, especially, theory change are understood in historical terms, employing concepts such as paradigm shift.
+However, Kuhn was also critical of attempts fully to unify the methods of history and philosophy of science: "Subversion is not, I think, too strong a term for the likely result of an attempt to make the two fields into one. They differ in a number of their central constitutive characteristics, of which the most general and apparent is their goals. The final product of most historical research is a narrative, a story, about particulars of the past. [...] The philosopher, on the other hand, aims principally at explicit generalizations and at those with universal scope. He is no teller of stories, true or false. His goal is to discover and state what is true at all times and places rather than to impart understanding of what occurred at a particular time and place."  More recent work questions whether these methodological and conceptual divisions are in fact barriers to a unified discipline.
+
+
+== See also ==
+
+Index of philosophy of science articles
+Historical epistemology
+Historiography of science
+History of science and technology
+Sociology of the history of science
+
+
+== References ==

data/en.wikipedia.org/wiki/History_of_anthropometry-0.md

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+---
+title: "History of anthropometry"
+chunk: 1/5
+source: "https://en.wikipedia.org/wiki/History_of_anthropometry"
+category: "reference"
+tags: "science, encyclopedia"
+date_saved: "2026-05-05T03:10:21.668562+00:00"
+instance: "kb-cron"
+---
+
+The history of anthropometry includes its use as an early tool of anthropology, use for identification, use for the purposes of understanding human physical variation in paleoanthropology and in various attempts to correlate physical with racial and psychological traits. At various points in history, certain anthropometrics have been cited by advocates of discrimination and eugenics often as a part of some social movement or through pseudoscientific claims.
+
+== Craniometry and paleoanthropology ==
+
+In 1716 Louis-Jean-Marie Daubenton, who wrote many essays on comparative anatomy for the Académie française, published his Memoir on the Different Positions of the Occipital Foramen in Man and Animals (Mémoire sur les différences de la situation du grand trou occipital dans l'homme et dans les animaux). Six years later Pieter Camper (1722–1789), distinguished both as an artist and as an anatomist, published some lectures that laid the foundation of much work. Camper invented the "facial angle," a measure meant to determine intelligence among various species. According to this technique, a "facial angle" was formed by drawing two lines: one horizontally from the nostril to the ear; and the other perpendicularly from the advancing part of the upper jawbone to the most prominent part of the forehead. Camper's measurements of facial angle were first made to compare the skulls of men with those of other animals. Camper claimed that antique statues presented an angle of 90°, Europeans of 80°, Central Africans of 70° and the orangutan of 58°.
+Swedish professor of anatomy Anders Retzius (1796–1860) first used the cephalic index in physical anthropology to classify ancient human remains found in Europe. He classed skulls in three main categories; "dolichocephalic" (from the Ancient Greek kephalê "head", and dolikhos "long and thin"), "brachycephalic" (short and broad) and "mesocephalic" (intermediate length and width). Scientific research was continued by Étienne Geoffroy Saint-Hilaire (1772–1844) and Paul Broca (1824–1880), founder of the Anthropological Society in France in 1859. Paleoanthropologists still rely upon craniofacial anthropometry to identify species in the study of fossilized hominid bones. Specimens of Homo erectus and athletic specimens of Homo sapiens, for example, are virtually identical from the neck down but their skulls can easily be told apart.
+
+Samuel George Morton (1799–1851), whose two major monographs were the Crania Americana (1839), An Inquiry into the Distinctive Characteristics of the Aboriginal Race of America and Crania Aegyptiaca (1844) concluded that the ancient Egyptians were not Negroid but Caucasoid and that Caucasians and Negroes were already distinct three thousand years ago. Since The Bible indicated that Noah's Ark had washed up on Mount Ararat only a thousand years before this Noah's sons could not account for every race on earth. According to Morton's theory of polygenism the races had been separate from the start. Josiah C. Nott and George Gliddon carried Morton's ideas further. Charles Darwin, who thought the single-origin hypothesis essential to evolutionary theory, opposed Nott and Gliddon in his 1871 The Descent of Man, arguing for monogenism.
+In 1856, workers found in a limestone quarry the skull of a Neanderthal hominid male, thinking it to be the remains of a bear. They gave the material to amateur naturalist Johann Karl Fuhlrott who turned the fossils over to anatomist Hermann Schaaffhausen. The discovery was jointly announced in 1857, giving rise to the discipline of paleoanthropology. By comparing skeletons of apes to man, T. H. Huxley (1825–1895) backed up Charles Darwin's theory of evolution, first expressed in On the Origin of Species (1859). He also developed the "Pithecometra principle," which stated that man and ape were descended from a common ancestor.
+Eugène Dubois' (1858–1940) discovery in 1891 in Indonesia of the "Java Man", the first specimen of Homo erectus to be discovered, demonstrated mankind's deep ancestry outside Europe. Ernst Haeckel (1834–1919) became famous for his "recapitulation theory", according to which each individual mirrors the evolution of the whole species during his life.
+
+== Typology and personality ==
+
+Intelligence testing was compared with anthropometrics. Samuel George Morton (1799–1851) collected hundreds of human skulls from all over the world and started trying to find a way to classify them according to some logical criterion. Morton claimed that he could judge intellectual capacity by cranial capacity. A large skull meant a large brain and high intellectual capacity; a small skull indicated a small brain and decreased intellectual capacity. Modern science has since confirmed that there is a correlation between cranium size (measured in various ways) and intelligence as measured by IQ tests, although it is a weak correlation at about 0.2. Today, brain volume as measured with MRI scanners also find a correlation between brain size and intelligence at about 0.4.
+Craniometry was also used in phrenology, which purported to determine character, personality traits, and criminality on the basis of the shape of the head. At the turn of the 19th century, Franz Joseph Gall (1758–1822) developed "cranioscopy" (Ancient Greek kranion "skull", scopos "vision"), a method to determine the personality and development of mental and moral faculties on the basis of the external shape of the skull. Cranioscopy was later renamed phrenology (phrenos: mind, logos: study) by his student Johann Spurzheim (1776–1832), who wrote extensively on "Drs. Gall and Spurzheim's physiognomical System." These all claimed the ability to predict traits or intelligence and were intensively practised in the 19th and the first part of the 20th century.
+During the 1940s anthropometry was used by William Sheldon when evaluating his somatotypes, according to which characteristics of the body can be translated into characteristics of the mind. Inspired by Cesare Lombroso's criminal anthropology, he also believed that criminality could be predicted according to the body type.  A basically anthropometric division of body types into the categories endomorphic, ectomorphic and mesomorphic derived from Sheldon's somatotype theories is today popular among people doing weight training.
+
+== Forensic anthropometry ==
+
+=== Bertillon, Galton and criminology ===

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+---
+title: "History of anthropometry"
+chunk: 2/5
+source: "https://en.wikipedia.org/wiki/History_of_anthropometry"
+category: "reference"
+tags: "science, encyclopedia"
+date_saved: "2026-05-05T03:10:21.668562+00:00"
+instance: "kb-cron"
+---
+
+In 1883, Frenchman Alphonse Bertillon introduced a system of identification that was named after him. The "Bertillonage" system was based on the finding that several measures of physical features, such as the dimensions of bony structures in the body, remain fairly constant throughout adult life. Bertillon concluded that when these measurements were made and recorded systematically, every individual would be distinguishable. Bertillon's goal was a way of identifying recidivists ("repeat offenders"). Previously police could only record general descriptions. Photography of criminals had become commonplace, but there was no easy way to sort the many thousands of photographs except by name. Bertillon's hope was that, through the use of measurements, a set of identifying numbers could be entered into a filing system installed in a single cabinet.
+
+The system involved 10 measurements; height, stretch (distance from left shoulder to middle finger of raised right arm), bust (torso from head to seat when seated), head length (crown to forehead) and head width temple to temple) width of cheeks, and "lengths" of the right ear, the left foot, middle finger, and cubit (elbow to tip of middle finger). It was possible, by exhaustion, to sort the cards on which these details were recorded (together with a photograph) until a small number produced the measurements of the individual sought, independently of name.
+
+The system was soon adapted to police methods: it prevented impersonation and could demonstrate wrongdoing.
+Bertillonage was before long represented in Paris by a collection of some 100,000 cards and became popular in several other countries' justice systems. England followed suit when in 1894, a committee sent to Paris to investigate the methods and its results reported favorably on the use of measurements for primary classification and recommended also the partial adoption of the system of finger prints suggested by Francis Galton, then in use in Bengal, where measurements were abandoned in 1897 after the fingerprint system was adopted throughout British India. Three years later England followed suit, and, as the result of a fresh inquiry ordered by the Home Office, relied upon fingerprints alone.
+Bertillonage exhibited certain defects and was gradually supplanted by the system of fingerprints and, latterly, genetics. Bertillon originally measured variables he thought were independent – such as forearm length and leg length – but Galton had realized that both were the result of a single causal variable (in this case, stature) and  developed the statistical concept of correlation.
+Other complications were: it was difficult to tell whether or not individuals arrested were first-time offenders; instruments employed were costly and liable to break down; skilled measurers were needed; errors were frequent and all but irremediable; and it was necessary to repeat measurements three times to arrive at a mean result.
+
+=== Physiognomy ===
+
+Physiognomy claimed a correlation between physical features (especially facial features) and character traits. It was made famous by Cesare Lombroso (1835–1909), the founder of anthropological criminology, who claimed to be able to scientifically identify links between the nature of a crime and the personality or physical appearance of the offender. The originator of the concept of a "born criminal" and arguing in favor of biological determinism, Lombroso tried to recognize criminals by measurements of their bodies. He concluded that skull and facial features were clues to genetic criminality and that these features could be measured with craniometers and calipers with the results developed into quantitative research. A few of the 14 identified traits of a criminal included large jaws, forward projection of jaw, low sloping forehead; high cheekbones, flattened or upturned nose; handle-shaped ears; hawk-like noses or fleshy lips; hard shifty eyes; scanty beard or baldness; insensitivity to pain; long arms, and so on.
+
+== Phylogeography, race and human origins ==

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+title: "History of anthropometry"
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+
+Phylogeography is the science of identifying and tracking major human migrations, especially in prehistoric times. Linguistics can follow the movement of languages and archaeology can follow the movement of artefact styles but neither can tell whether a culture's spread was due to a source population's physically migrating or to a destination population's simply copying the technology and learning the language. Anthropometry was used extensively by anthropologists studying human and racial origins: some attempted racial differentiation and classification, often seeking ways in which certain races were inferior to others. Nott translated Arthur de Gobineau's An Essay on the Inequality of the Human Races (1853–1855), a founding work of racial segregationism that made three main divisions between races, based not on colour but on climatic conditions and geographic location, and privileged the "Aryan" race.   Science has tested many theories aligning race and personality, which have been current since Boulainvilliers (1658–1722)  contrasted the Français (French people), alleged descendants of the Nordic Franks, and members of the aristocracy, to the Third Estate, considered to be indigenous Gallo-Roman people subordinated by right of conquest.
+François Bernier, Carl Linnaeus and Blumenbach had examined multiple observable human characteristics in search of a typology. Bernier based his racial classification on physical type which included hair shape, nose shape and skin color. Linnaeus based a similar racial classification scheme. As anthropologists gained access to methods of skull measure they developed racial classification based on skull shape.
+Theories of scientific racism became popular, one prominent figure being Georges Vacher de Lapouge (1854–1936), who in L'Aryen et son rôle social ("The Aryan and his social role", 1899) divided humanity into various, hierarchized, different "races", spanning from the "Aryan white race, dolichocephalic" to the "brachycephalic" (short and broad-headed) race. Between these Vacher de Lapouge identified the "Homo europaeus (Teutonic, Protestant, etc.), the "Homo alpinus" (Auvergnat, Turkish, etc.) and the "Homo mediterraneus" (Napolitano, Andalus, etc.). "Homo africanus" (Congo, Florida) was excluded from discussion. His racial classification ("Teutonic", "Alpine" and "Mediterranean") was also used by William Z. Ripley (1867–1941) who, in The Races of Europe (1899), made a map of Europe according to the cephalic index of its inhabitants.
+Vacher de Lapouge became one of the leading inspirations of Nazi antisemitism and Nazi ideology. Nazi Germany relied on anthropometric measurements to distinguish Aryans from Jews and many forms of anthropometry were used for the advocacy of eugenics. During the 1920s and 1930s, though, members of the school of cultural anthropology of Franz Boas began to use anthropometric approaches to discredit the concept of fixed biological race.  Boas used the cephalic index to show the influence of environmental factors. Researches on skulls and skeletons eventually helped liberate 19th century European science from its ethnocentric bias. This school of physical anthropology generally went into decline during the 1940s.
+
+=== Race and brain size ===
+Several studies have demonstrated correlations between race and brain size, with varying results. In some studies, Caucasians were reported to have larger brains than other racial groups, whereas in recent studies and reanalysis of previous studies, East Asians were reported as having larger brains and skulls. More common among the studies was the report that Africans had smaller skulls than either Caucasians or East Asians. Criticisms have been raised against a number of these studies regarding questionable methods.

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+
+In Crania Americana Morton claimed that Caucasians had the biggest brains, averaging 87 cubic inches, Indians were in the middle with an average of 82 cubic inches and Negroes had the smallest brains with an average of 78 cubic inches. In 1873 Paul Broca (1824–1880) found the same pattern described by Samuel Morton's Crania Americana by weighing brains at autopsy. Other historical studies alleging a Black–White difference in brain size include Bean (1906), Mall, (1909), Pearl, (1934) and Vint (1934). But in Germany Rudolf Virchow's study led him to denounce "Nordic mysticism" in the 1885 Anthropology Congress in Karlsruhe. Josef Kollmann, a collaborator of Virchow, stated in the same congress that the people of Europe, be them German, Italian, English or French, belonged to a "mixture of various races," furthermore declaring that the "results of craniology" led to "struggle against any theory concerning the superiority of this or that European race". Virchow later rejected measure of skulls as legitimate means of taxonomy. Paul Kretschmer quoted an 1892 discussion with him concerning these criticisms, also citing Aurel von Törok's 1895 work, who basically proclaimed the failure of craniometry.
+Stephen Jay Gould (1941–2002) claimed Samuel Morton had fudged data and "overpacked" the skulls. A subsequent study by John Michael concluded that "[c]ontrary to Gould's interpretation... Morton's research was conducted with integrity." In 2011 physical anthropologists at the university of, which owns Morton's collection, published a study that concluded that "Morton did not manipulate his data to support his preconceptions, contra Gould."  They identified and remeasured half of the skulls used in Morton's reports, finding that in only 2% of cases did Morton's measurements differ significantly from their own and that these errors either were random or gave a larger than accurate volume to African skulls, the reverse of the bias that Dr. Gould imputed to Morton. Difference in brain size, however, does not necessarily imply differences in intelligence: women tend to have smaller brains than men yet have more neural complexity and loading in certain areas of the brain. This claim has been criticized by, among others, John S. Michael, who reported in 1988 that Morton's analysis was "conducted with integrity" while Gould's criticism was "mistaken".
+Similar claims were previously made by Ho et al. (1980), who measured 1,261 brains at autopsy, and Beals et al. (1984), who measured approximately 20,000 skulls, finding the same East Asian → European → African pattern but warning against using the findings as indicative of racial traits, "If one merely lists such means by geographical region or race, causes of similarity by genogroup and ecotype are hopelessly confounded". Rushton's findings have been criticized for confusing African-Americans with equatorial Africans, who generally have smaller craniums as people from hot climates often have slightly smaller crania. He also compared equatorial Africans from the poorest and least educated areas of Africa with Asians from the wealthiest, most educated areas and colder climates. According to Z. Z. Cernovsky Rushton's own study shows that the average cranial capacity of North American blacks is similar to that of Caucasians from comparable climatic zones, though a previous work by Rushton showed appreciable differences in cranial capacity between North Americans of different race. This is consistent with the findings of Z. Z. Cernovsky that people from different climates tend to have minor differences in brain size.
+
+=== Race, identity and cranio-facial description ===
+
+Observable craniofacial differences included: head shape (mesocephalic, brachycephalic, dolichocephalic) breadth of nasal aperture, nasal root height, sagittal crest appearance, jaw thickness, brow ridge size and forehead slope. Using this skull-based categorization, German philosopher Christoph Meiners in his The Outline of History of Mankind (1785) identified three racial groups:

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+
+Caucasoid characterized by a tall dolichocephalic skull, receded zygomas, large brow ridge and projecting-narrow nasal apertures.
+Negroid characterized by a short dolichocephalic skull, receded zygomas and wide nasal apertures.
+Mongoloid characterized by a medium brachycephalic skull, projecting zygomas, small brow ridge and small nasal apertures.
+Ripley's The Races of Europe was rewritten in 1939 by Harvard physical anthropologist Carleton S. Coon. Coon, a 20th-century craniofacial anthropometrist, used the technique for his The Origin of Races (New York: Knopf, 1962). Because of the inconsistencies in the old three-part system (Caucasoid, Mongoloid, Negroid), Coon adopted a five-part scheme. He defined "Caucasoid" as a pattern of skull measurements and other phenotypical characteristics typical of populations in Europe, Central Asia, South Asia, West Asia, North Africa, and Northeast Africa (Ethiopia, and Somalia). He discarded the term "Negroid" as misleading since it implies skin tone, which is found at low latitudes around the globe and is a product of adaptation, and defined skulls typical of sub-Saharan Africa as "Congoid" and those of Southern Africa as "Capoid". Finally, he split "Australoid" from "Mongoloid" along a line roughly similar to the modern distinction between sinodonts in the north and sundadonts in the south. He argued that these races had developed independently of each other over the past half-million years, developing into Homo Sapiens at different periods of time, resulting in different levels of civilization. This raised considerable controversy and led the American Anthropological Association to reject his approach without mentioning him by name.
+In The Races of Europe (1939) Coon classified Caucasoids into racial sub-groups named after regions or archaeological sites such as Brünn, Borreby, Alpine, Ladogan, East Baltic, Neo-Danubian, Lappish, Mediterranean, Atlanto-Mediterranean, Irano-Afghan, Nordic, Hallstatt, Keltic, Tronder, Dinaric, Noric and Armenoid. This typological view of race, however, was starting to be seen as out-of-date at the time of publication. Coon eventually resigned from the American Association of Physical Anthropologists, while some of his other works were discounted because he would not agree with the evidence brought forward by Franz Boas, Stephen Jay Gould, Richard Lewontin, Leonard Lieberman and others.
+The concept of biologically distinct races has been rendered obsolete by modern genetics. Different methods of categorizing humans yield different groups, making them non-concordant. Neither will the craniofacial method pin-point geographic origins reliably, due to variation in skulls within a geographic region. About one-third of "white" Americans have detectable African DNA markers, and about five percent of "black" Americans have no detectable "negroid" traits at all, craniofacial or genetic. Given three Americans who self-identify and are socially accepted as white, black and Hispanic, and given that they have precisely the same Afro-European mix of ancestries (one African great-grandparent), there is no objective test that will identify their group membership without an interview.
+
+== In popular culture ==
+The Bertillon system was used by the detectives in Caleb Carr's  novel The Alienist.
+
+== See also ==
+Anthropometry – Measurement of the human individual
+Anthropometric history – Study of the history of human height and weight
+Body roundness index – Body scale based on waist circumference and height
+Historical race concepts – Obsolete definitions of racial groups
+Scientific racism – Pseudoscientific justification for racism
+
+== References ==
+
+== Further reading ==
+Anthropometric Survey of Army Personnel: Methods and Summary Statistics 1988 Archived 2022-06-21 at the Wayback Machine
+ISO 7250: Basic human body measurements for technological design, International Organization for Standardization, 1998.
+ISO 8559: Garment construction and anthropometric surveys — Body dimensions, International Organization for Standardization, 1989.
+ISO 15535: General requirements for establishing anthropometric databases, International Organization for Standardization, 2000.
+ISO 15537: Principles for selecting and using test persons for testing anthropometric aspects of industrial products and designs, International Organization for Standardization, 2003.
+ISO 20685: 3-D scanning methodologies for internationally compatible anthropometric databases, International Organization for Standardization, 2005.
+National Health and Nutrition Examination Survey. Anthropometry Procedures Manual. CDC: Atlanta, USA; 2007.
+Komlos, John (2010). "Anthropometric History: an Overview of a Quarter Century of Research" (PDF). Anthropologischer Anzeiger. 67 (4): 341–56. doi:10.1127/0003-5548/2009/0027. PMID 20440956. Archived from the original (PDF) on 2016-03-05. Retrieved 2015-09-29.
+Folia Anthropologica: tudományos és módszertani folyóirat. 9: 5–17. ISSN 1786-5654
+Pheasant, Stephen (1986). Bodyspace: anthropometry, ergonomics, and design. London; Philadelphia: Taylor & Francis. ISBN 978-0-85066-352-5. (A classic review of human body sizes.)
+Stewart A. "Kinanthropometry and body composition: A natural home for three dimensional photonic scanning". Journal of Sports Sciences, March 2010; 28(5): 455–457.

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+
+The history of science covers the development of science from ancient times to the present. It encompasses all three major branches of science: natural, social, and formal. Protoscience, early sciences, and natural philosophies such as alchemy and astrology that existed during the Bronze Age, Iron Age, classical antiquity and the Middle Ages, declined after the emergence of modern sciences during the Scientific Revolution.
+The earliest roots of scientific thinking and practice can be traced to Ancient Egypt and Mesopotamia during the 3rd and 2nd millennia BCE. These civilizations' contributions to mathematics, astronomy, and medicine influenced later Greek natural philosophy of classical antiquity, wherein formal attempts were made to provide explanations of events in the physical world based on natural causes. After the fall of the Western Roman Empire, knowledge of Greek conceptions of the world deteriorated in Latin-speaking Western Europe during the early centuries (400 to 1000 CE) of the Middle Ages, but continued to thrive in the Greek-speaking Byzantine Empire. Aided by translations of Greek texts, the Hellenistic worldview was preserved and absorbed into the Arabic-speaking Muslim world during the Islamic Golden Age. The recovery and assimilation of Greek works and Islamic inquiries into Western Europe from the 10th to 13th century revived the learning of natural philosophy in the West. Traditions of early science were also developed in ancient India and separately in ancient China, the Chinese model having influenced Vietnam, Korea and Japan before Western exploration. Among the Pre-Columbian peoples of Mesoamerica, the Zapotec civilization established their first known traditions of astronomy and mathematics for producing calendars, followed by other civilizations such as the Maya.
+Natural philosophy was transformed by the Scientific Revolution that transpired during the 16th and 17th centuries in Europe, as new ideas and discoveries departed from previous Greek conceptions and traditions. The New Science that emerged was more mechanistic in its worldview, more integrated with mathematics, and more reliable and open as its knowledge was based on a newly defined scientific method. More "revolutions" in subsequent centuries soon followed. The chemical revolution of the 18th century, for instance, introduced new quantitative methods and measurements for chemistry. In the 19th century, new perspectives regarding the conservation of energy, age of Earth, and evolution came into focus. And in the 20th century, new discoveries in genetics and physics laid the foundations for new sub disciplines such as molecular biology and particle physics. Moreover, industrial and military concerns as well as the increasing complexity of new research endeavors ushered in the era of "big science," particularly after World War II.
+
+== Approaches to history of science ==
+
+The nature of the history of science - including both the definition of science and whether the English word "science" is a misleading term for pre-modern scholarship as well as non-scholarly knowledge of the natural world - is a topic of ongoing debate and sometimes significant friction between scientists, sociologists and historians. The history of science is often seen as a linear story of progress,
+but historians have come to see the story as more complex.
+Alfred Edward Taylor has characterised lean periods in the advance of scientific discovery as "periodical bankruptcies of science".
+The professionalization of the history of science in the 20th century was accompanied by a prodigious and proliferating specialization, with the field seeming to strive to match the protean diversity of modern science itself. Science is a human activity, and scientific contributions have come from people from a wide range of different backgrounds and cultures. Historians of science increasingly see their field as part of a global history of exchange, conflict and collaboration.
+The relationship between science and religion has been variously characterized in terms of "conflict", "harmony", "complexity", and "mutual independence", among others. Events in Europe such as the Galileo affair of the early 17th century led scholars such as John William Draper to postulate (c. 1874) a conflict thesis, suggesting that religion and science have been in conflict methodologically, factually and politically throughout history. The "conflict thesis" has since lost favor among the majority of contemporary scientists and historians of science. However, some contemporary philosophers and scientists, such as Richard Dawkins, still subscribe to this thesis.
+Historians have emphasized that trust is necessary for agreement on claims about nature. In this light, the 1660 establishment of the Royal Society and its code of experiment – trustworthy because witnessed by its members – has become an important chapter in the history of science. Many people in modern history (typically women and persons of color) were excluded from elite scientific communities and characterized by the science establishment as inferior. Historians in the 1980s and 1990s described the structural barriers to participation and began to recover the contributions of overlooked individuals. Historians have also investigated the mundane practices of science such as fieldwork and specimen collection, correspondence, drawing, record-keeping, and the use of laboratory and field equipment.
+
+== Prehistory ==

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+In prehistoric times, knowledge and technique were passed from generation to generation in an oral tradition. For instance, the domestication of maize for agriculture has been dated to about 9,000 years ago in southern Mexico, before the development of writing systems. Similarly, archaeological evidence indicates the development of astronomical knowledge in preliterate societies.
+The oral tradition of preliterate societies had several features, the first of which was its fluidity. New information was constantly absorbed and adjusted to new circumstances or community needs. There were no archives or reports. This fluidity was closely related to the practical need to explain and justify a present state of affairs. Another feature was the tendency to describe the universe as just sky and earth, with a potential underworld. They were also prone to identify causes with beginnings, thereby providing a historical origin with an explanation. There was also a reliance on a "medicine man" or "wise woman" for healing, knowledge of divine or demonic causes of diseases, and in more extreme cases, for rituals such as exorcism, divination, songs, and incantations. Finally, there was an inclination to unquestioningly accept explanations that might be deemed implausible in more modern times while at the same time not being aware that such credulous behaviors could have posed problems.
+The development of writing enabled humans to store and communicate knowledge across generations with much greater accuracy. Its invention was a prerequisite for the development of philosophy and later science in ancient times. Moreover, the extent to which philosophy and science would flourish in ancient times depended on the efficiency of a writing system (e.g., use of alphabets).
+
+== Ancient Near East and North East Africa ==
+
+The earliest roots of science can be traced to the Ancient Near East and North East Africa c. 3000–1200 BCE – in particular to Ancient Egypt and Mesopotamia.
+
+=== Ancient Egypt ===
+
+Archaeological evidence has suggested that the Ancient Egyptian counting system had origins in Sub-Saharan Africa. Also, fractal geometry designs which are widespread among Sub-Saharan African cultures are also found in Egyptian architecture and cosmological signs.The Ishango bone, according to scholar Alexander Marshack, may have influenced the later development of mathematics in Egypt as, like some entries on the Ishango bone, Egyptian arithmetic also made use of multiplication by 2; this however, is disputed. Megalithic structures located in Nabta Playa, Upper Egypt featured astronomy, calendar arrangements in alignment with the heliacal rising of Sirius and supported calibration the yearly calendar for the annual Nile flood. These practices have been linked with the emergence of cosmology in Old Kingdom Egypt.
+
+==== Number system and geometry ====
+Starting c. 3000 BCE, the ancient Egyptians developed a numbering system that was decimal in character and had oriented their knowledge of geometry to solving practical problems such as those of surveyors and builders. Their development of geometry was itself a necessary development of surveying to preserve the layout and ownership of farmland, which was flooded annually by the Nile. The 3-4-5 right triangle and other rules of geometry were used to build rectilinear structures, and the post and lintel architecture of Egypt.
+
+==== Disease and healing ====
+
+Egypt was also a center of alchemy research for much of the Mediterranean. According to the medical papyri (written c. 2500–1200 BCE), the ancient Egyptians believed that disease was mainly caused by the invasion of bodies by evil forces or spirits. Thus, in addition to medicine, therapies included prayer, incantation, and ritual. The Ebers Papyrus, written c. 1600 BCE, contains medical recipes for treating diseases related to the eyes, mouth, skin, internal organs, and extremities, as well as abscesses, wounds, burns, ulcers, swollen glands, tumors, headaches, and bad breath. The Edwin Smith Papyrus, written at about the same time, contains a surgical manual for treating wounds, fractures, and dislocations. The Egyptians believed that the effectiveness of their medicines depended on the preparation and administration under appropriate rituals. Medical historians believe that ancient Egyptian pharmacology, for example, was largely ineffective. Both the Ebers and Edwin Smith papyri applied the following components to the treatment of disease: examination, diagnosis, treatment, and prognosis, which display strong parallels to the basic empirical method of science and, according to G. E. R. Lloyd, played a significant role in the development of this methodology.
+
+==== Calendar ====
+The ancient Egyptians even developed an official calendar that contained twelve months, thirty days each, and five days at the end of the year. Unlike the Babylonian calendar or the ones used in Greek city-states at the time, the official Egyptian calendar was much simpler as it was fixed and did not take lunar and solar cycles into consideration.
+
+=== Ancient Nubia ===
+
+==== Medicine ====
+Nubian mummies studied in the 1990s revealed that Kush was a pioneer of early antibiotics.
+Tetracycline was being used by Nubians, based on bone remains between 350 AD and 550 AD. The antibiotic was in wide commercial use only in the mid 20th century. The theory states that earthen jars containing grain used for making beer contained the bacterium streptomyces, which produced tetracycline. Although Nubians were not aware of tetracycline, they could have noticed that people fared better by drinking beer than just consuming the grain itself. According to Charlie Bamforth, a professor of biochemistry and brewing science at the University of California, Davis, "They must have consumed it because it was rather tastier than the grain from which it was derived."
+
+=== Mathematics ===
+Based on engraved plans of Meroitic King Amanikhabali's pyramids, Nubians had a sophisticated understanding of mathematics as they appreciated the harmonic ratio. The engraved plans are indicative of much to be revealed about Nubian mathematics. The ancient Nubians also established a system of geometry which they used in creating early versions of sun clocks. During the Meroitic period in Nubian history, the Nubians used a trigonometric methodology similar to the Egyptians.
+
+=== Mesopotamia ===

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+
+==== Advancements in mathematics ====
+Most of the achievements by Islamic scholars during this period were in mathematics. Arabic mathematics was a direct descendant of Greek and Indian mathematics. For instance, what is now known as Arabic numerals originally came from India, but Muslim mathematicians made several key refinements to the number system, such as the introduction of decimal point notation. Mathematicians such as Muhammad ibn Musa al-Khwarizmi (c. 780–850) gave his name to the concept of the algorithm, while the term algebra is derived from al-jabr, the beginning of the title of one of his publications. Islamic trigonometry continued from the works of Ptolemy's Almagest and Indian Siddhanta, from which they added trigonometric functions, drew up tables, and applied trigonometry to spheres and planes. Many of their engineers, instruments makers, and surveyors contributed books in applied mathematics. It was in astronomy where Islamic mathematicians made their greatest contributions. Al-Battani (c. 858–929) improved the measurements of Hipparchus, preserved in the translation of Ptolemy's Hè Megalè Syntaxis (The great treatise) translated as Almagest. Al-Battani also improved the precision of the measurement of the precession of the Earth's axis. Corrections were made to Ptolemy's geocentric model by al-Battani, Ibn al-Haytham, Averroes and the Maragha astronomers such as Nasir al-Din al-Tusi, Mu'ayyad al-Din al-Urdi and Ibn al-Shatir.
+Scholars with geometric skills made significant improvements to the earlier classical texts on light and sight by Euclid, Aristotle, and Ptolemy. The earliest surviving Arabic treatises were written in the 9th century by Abū Ishāq al-Kindī, Qustā ibn Lūqā, and (in fragmentary form) Ahmad ibn Isā. Later in the 11th century, Ibn al-Haytham (known as Alhazen in the West), a mathematician and astronomer, synthesized a new theory of vision based on the works of his predecessors. His new theory included a complete system of geometrical optics, which was set in great detail in his Book of Optics. His book was translated into Latin and was relied upon as a principal source on the science of optics in Europe until the 17th century.
+
+==== Institutionalization of medicine ====
+The medical sciences were prominently cultivated in the Islamic world. The works of Greek medical theories, especially those of Galen, were translated into Arabic and there was an outpouring of medical texts by Islamic physicians, which were aimed at organizing, elaborating, and disseminating classical medical knowledge. Medical specialties started to emerge, such as those involved in the treatment of eye diseases such as cataracts. Ibn Sina (known as Avicenna in the West, c. 980–1037) was a prolific Persian medical encyclopedist wrote extensively on medicine, with his two most notable works in medicine being the Kitāb al-shifāʾ ("Book of Healing") and The Canon of Medicine, both of which were used as standard medicinal texts in both the Muslim world and in Europe well into the 17th century. Amongst his many contributions are the discovery of the contagious nature of infectious diseases, and the introduction of clinical pharmacology. Institutionalization of medicine was another important achievement in the Islamic world. Although hospitals as an institution for the sick emerged in the Byzantium empire, the model of institutionalized medicine for all social classes was extensive in the Islamic empire and was scattered throughout. In addition to treating patients, physicians could teach apprentice physicians, as well write and do research. The discovery of the pulmonary transit of blood in the human body by Ibn al-Nafis occurred in a hospital setting.
+
+==== Decline ====
+Islamic science began its decline in the 12th–13th century, before the Renaissance in Europe, due in part to the Christian reconquest of Spain and the Mongol conquests in the East in the 11th–13th century. The Mongols sacked Baghdad, capital of the Abbasid Caliphate, in 1258, which ended the Abbasid empire. Nevertheless, many of the conquerors became patrons of the sciences. Hulagu Khan, for example, who led the siege of Baghdad, became a patron of the Maragheh observatory. Islamic astronomy continued to flourish into the 16th century.
+
+=== Western Europe ===
+
+By the eleventh century, most of Europe had become Christian; stronger monarchies emerged; borders were restored; technological developments and agricultural innovations were made, increasing the food supply and population. Classical Greek texts were translated from Arabic and Greek into Latin, stimulating scientific discussion in Western Europe.
+In classical antiquity, Greek and Roman taboos had meant that dissection was usually banned, but in the Middle Ages medical teachers and students at Bologna began to open human bodies, and Mondino de Luzzi (c. 1275–1326) produced the first known anatomy textbook based on human dissection.
+As a result of the Pax Mongolica, Europeans, such as Marco Polo, began to venture further and further east. The written accounts of Polo and his fellow travelers inspired other Western European maritime explorers to search for a direct sea route to Asia, ultimately leading to the Age of Discovery.
+Technological advances were also made, such as the early flight of Eilmer of Malmesbury (who had studied mathematics in 11th-century England), and the metallurgical achievements of the Cistercian blast furnace at Laskill.

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+
+==== Medieval universities ====
+An intellectual revitalization of Western Europe started with the birth of medieval universities in the 12th century. These urban institutions grew from the informal scholarly activities of learned friars who visited monasteries, consulted libraries, and conversed with other fellow scholars. A friar who became well-known would attract a following of disciples, giving rise to a brotherhood of scholars (or collegium in Latin). A collegium might travel to a town or request a monastery to host them. However, if the number of scholars within a collegium grew too large, they would opt to settle in a town instead. As the number of collegia within a town grew, the collegia might request that their king grant them a charter that would convert them into a universitas. Many universities were chartered during this period, with the first in Bologna in 1088, followed by Paris in 1150, Oxford in 1167, and Cambridge in 1231. The granting of a charter meant that the medieval universities were partially sovereign and independent from local authorities. Their independence allowed them to conduct themselves and judge their own members based on their own rules. Furthermore, as initially religious institutions, their faculties and students were protected from capital punishment (e.g., gallows). Such independence was a matter of custom, which could, in principle, be revoked by their respective rulers if they felt threatened. Discussions of various subjects or claims at these medieval institutions, no matter how controversial, were done in a formalized way so as to declare such discussions as being within the bounds of a university and therefore protected by the privileges of that institution's sovereignty. A claim could be described as ex cathedra (literally "from the chair", used within the context of teaching) or ex hypothesi (by hypothesis). This meant that the discussions were presented as purely an intellectual exercise that did not require those involved to commit themselves to the truth of a claim or to proselytize. Modern academic concepts and practices such as academic freedom or freedom of inquiry are remnants of these medieval privileges that were tolerated in the past.
+The curriculum of these medieval institutions centered on the seven liberal arts, which were aimed at providing beginning students with the skills for reasoning and scholarly language. Students would begin their studies starting with the first three liberal arts or Trivium (grammar, rhetoric, and logic) followed by the next four liberal arts or Quadrivium (arithmetic, geometry, astronomy, and music). Those who completed these requirements and received their baccalaureate (or Bachelor of Arts) had the option to join the higher faculty (law, medicine, or theology), which would confer an LLD for a lawyer, an MD for a physician, or ThD for a theologian. Students who chose to remain in the lower faculty (arts) could work towards a Magister (or Master's) degree and would study three philosophies: metaphysics, ethics, and natural philosophy. Latin translations of Aristotle's works such as De Anima (On the Soul) and the commentaries on them were required readings. As time passed, the lower faculty was allowed to confer its own doctoral degree called the PhD. Many of the Masters were drawn to encyclopedias and had used them as textbooks. But these scholars yearned for the complete original texts of the Ancient Greek philosophers, mathematicians, and physicians such as Aristotle, Euclid, and Galen, which were not available to them at the time. These Ancient Greek texts were to be found in the Byzantine Empire and the Islamic World.
+
+==== Translations of Greek and Arabic sources ====
+Contact with the Byzantine Empire, and with the Islamic world during the Reconquista and the Crusades, allowed Latin Europe access to scientific Greek and Arabic texts, including the works of Aristotle, Ptolemy, Isidore of Miletus, John Philoponus, Jābir ibn Hayyān, al-Khwarizmi, Alhazen, Avicenna, and Averroes. European scholars had access to the translation programs of Raymond of Toledo, who sponsored the 12th century Toledo School of Translators from Arabic to Latin. Later translators like Michael Scotus would learn Arabic in order to study these texts directly. The European universities aided materially in the translation and propagation of these texts and started a new infrastructure which was needed for scientific communities. In fact, European university put many works about the natural world and the study of nature at the center of its curriculum, with the result that the "medieval university laid far greater emphasis on science than does its modern counterpart and descendent."
+At the beginning of the 13th century, there were reasonably accurate Latin translations of the main works of almost all the intellectually crucial ancient authors, allowing a sound transfer of scientific ideas via both the universities and the monasteries. By then, the natural philosophy in these texts began to be extended by scholastics such as Robert Grosseteste, Roger Bacon, Albertus Magnus and Duns Scotus. Precursors of the modern scientific method, influenced by earlier contributions of the Islamic world, can be seen already in Grosseteste's emphasis on mathematics as a way to understand nature, and in the empirical approach admired by Bacon, particularly in his Opus Majus. Pierre Duhem's thesis is that Stephen Tempier – the Bishop of Paris – Condemnation of 1277 led to the study of medieval science as a serious discipline, "but no one in the field any longer endorses his view that modern science started in 1277". However, many scholars agree with Duhem's view that the mid-late Middle Ages saw important scientific developments.

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+title: "History of science"
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+category: "reference"
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+date_saved: "2026-05-05T03:10:13.353605+00:00"
+instance: "kb-cron"
+---
+
+==== Medieval science ====
+The first half of the 14th century saw much important scientific work, largely within the framework of scholastic commentaries on Aristotle's scientific writings. William of Ockham emphasized the principle of parsimony: natural philosophers should not postulate unnecessary entities, so that motion is not a distinct thing but is only the moving object and an intermediary "sensible species" is not needed to transmit an image of an object to the eye. Scholars such as Jean Buridan and Nicole Oresme started to reinterpret elements of Aristotle's mechanics. In particular, Buridan developed the theory that impetus was the cause of the motion of projectiles, which was a first step towards the modern concept of inertia. The Oxford Calculators began to mathematically analyze the kinematics of motion, making this analysis without considering the causes of motion. In 1348, the Black Death and other disasters sealed a sudden end to philosophic and scientific development. 
+
+== Renaissance ==
+
+=== Printing and discovery ===
+
+The introduction and rapid spread of the movable type printing press during the 2nd half of the 15th century ended the manuscript culture of the Middle Ages, where facts were few and far between, and replaced it with a printing culture where reliable and documented facts rapidly proliferated and became the secure foundation for scientific knowledge. 
+The Fall of Constantinople in 1453 caused many Byzantine scholars to seek refuge in the West. 
+In the mid-15th century, Venetian glassmakers developed the exceptionally clear colourless glass, cristallo, made from high-purity quartz pebbles (instead of sand) and using manganese oxide as a "decolorizer" to neutralize the greenish tint caused by iron impurities. This was the "specialty" glass of the era, a luxury product used for windows, mirrors, ships' lanterns, and lenses. When the first telescope was later invented during the Scientific Revolution, the first historical record of the invention did not appear in a work of natural philosophy but rather in a patent filed by a spectacle maker.
+The encounter with the Americas, continents that were completely unknown to the ancients, profoundly impacted European intellectual life in the 16th century and specifically undermined the authority of Claudius Ptolemy, the 2nd-century scholar whose geographic and astronomical models had previously been considered infallible.
+Vesalius's work on human cadavers found problems with the Galenic view of anatomy.
+The Northern Renaissance showed a decisive shift in focus from Aristotelian natural philosophy to chemistry and the biological sciences (botany, anatomy, and medicine).
+
+=== Copernican heliocentrism ===
+
+Copernican heliocentrism is the astronomical model developed by Nicolaus Copernicus and published in 1543. This model positioned the Sun near the center of the Universe, motionless, with Earth and the other planets orbiting around it in circular motions, modified by epicycles, and at uniform speeds. The Copernican model challenged the dominant geocentric model of Ptolemy, which had placed Earth at the center of the Universe. 16th-century astronomers believed that Copernicus' elimination of the equant was his chief achievement but his model never displaced Ptolemy's, which only fell out of favor 70 years later after Galileo's telescopic observations of 1610.
+
+== Scientific Revolution and birth of New Science ==
+The Scientific Revolution of the 16th and 17th centuries in Europe marked a sharp break with the natural philosophy that had preceded it. The New Science that emerged departed from previous Greek conceptions and traditions, was more mechanistic in its worldview and more integrated with mathematics, and was obsessed with the acquisition and interpretation of new evidence. The Scientific Revolution is a convenient boundary between ancient thought and modern science. While the period is frequently said to have begun in 1543 with the printings of De humani corporis fabrica (On the Workings of the Human Body) by Andreas Vesalius and De Revolutionibus (On the Revolutions of the Heavenly Spheres) by Nicolaus Copernicus, the SN 1572 supernova has also been suggested as its beginning. The period culminated with the publication of the Philosophiæ Naturalis Principia Mathematica in 1687 by Isaac Newton, representative of the unprecedented growth of scientific publications throughout Europe.
+
+=== Modern astronomy ===
+
+Tycho Brahe's unprecedentedly accurate astronomical observations in the late 16th century and Galileo Galilei’s early 17th-century telescopic observations combined to turn astronomy into the first modern science. Galileo's observations ended a millenium of pre-modern astronomical orthodoxy while Johannes Kepler used Brahe's data to discover that planets have elliptical, not circular, orbits and develop the laws of planetary motion. Because of Kepler, astronomical phenomena came to be seen as being governed by physical laws.
+
+=== Calculus and Newtonian mechanics ===
+
+In 1687, Isaac Newton published the Principia Mathematica, detailing two comprehensive and successful physical theories: Newton's laws of motion, which led to classical mechanics; and Newton's law of universal gravitation, which describes the fundamental force of gravity.
+
+=== Emergence of chemistry ===
+
+A decisive moment came when "chemistry" was distinguished from alchemy by Robert Boyle in his work The Sceptical Chymist, in 1661; although the alchemical tradition continued for some time after his work. Other important steps included the gravimetric experimental practices of medical chemists like William Cullen, Joseph Black, Torbern Bergman and Pierre Macquer and through the work of Antoine Lavoisier ("father of modern chemistry") on oxygen and the law of conservation of mass, which refuted phlogiston theory. Modern chemistry emerged from the sixteenth through the eighteenth centuries through the material practices and theories promoted by alchemy, medicine, manufacturing and mining.
+
+=== Circulatory system ===
+William Harvey published De Motu Cordis in 1628, which revealed his conclusions based on his extensive studies of vertebrate circulatory systems. He identified the central role of the heart, arteries, and veins in producing blood movement in a circuit, and failed to find any confirmation of Galen's pre-existing notions of heating and cooling functions. The history of early modern biology and medicine is often told through the search for the seat of the soul. Galen in his descriptions of his foundational work in medicine presents the distinctions between arteries, veins, and nerves using the vocabulary of the soul.

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+---
+
+=== Scientific societies and journals ===
+A critical innovation was the creation of permanent scientific societies and their scholarly journals, which dramatically sped the diffusion of new ideas. Typical was the founding of the Royal Society in London in 1660 and its journal in 1665 the Philosophical Transaction of the Royal Society, the first scientific journal in English. 1665 also saw the first journal in French, the Journal des sçavans. Science drawing on the works of Newton, Descartes, Pascal and Leibniz, science was on a path to modern mathematics, physics and technology by the time of the generation of Benjamin Franklin (1706–1790), Leonhard Euler (1707–1783), Mikhail Lomonosov (1711–1765) and Jean le Rond d'Alembert (1717–1783). Denis Diderot's Encyclopédie, published between 1751 and 1772 brought this new understanding to a wider audience. The impact of this process was not limited to science and technology, but affected philosophy (Immanuel Kant, David Hume), religion (the increasingly significant impact of science upon religion), and society and politics in general (Adam Smith, Voltaire).
+
+=== Developments in geology ===
+Geology did not undergo systematic restructuring during the Scientific Revolution but instead existed as a cloud of isolated, disconnected ideas about rocks, minerals, and landforms long before it became a coherent science. Robert Hooke formulated a theory of earthquakes, and Nicholas Steno developed the theory of superposition and argued that fossils were the remains of once-living creatures. Beginning with Thomas Burnet's Sacred Theory of the Earth in 1681, natural philosophers began to explore the idea that the Earth had changed over time. Burnet and his contemporaries interpreted Earth's past in terms of events described in the Bible, but their work laid the intellectual foundations for secular interpretations of Earth history.
+
+== Romanticism and Post-Scientific Revolution ==
+
+=== Bioelectricity ===
+During the late 18th century, researchers such as Hugh Williamson and John Walsh experimented on the effects of electricity on the human body. Further studies by Luigi Galvani and Alessandro Volta established the electrical nature of what Volta called galvanism.
+Electricity thus became in Romanticism a multifaceted symbol representing both revolutionary fervor and the creative force of nature, as well as a metaphor for the pervasive power of the mind and its spiritual connection. Its presence, both literal and figurative, in both scientific experiments and literature, such as Galvani's study of electrical effects on bodies, fueled the Romantic imagination, serving as a vital concept bridging the animate and the inanimate, the rational and the spiritual.
+
+=== Developments in geology ===
+
+Modern geology, like modern chemistry, gradually evolved during the 18th and early 19th centuries. Benoît de Maillet and the Comte de Buffon saw the Earth as much older than the 6,000 years envisioned by biblical scholars. Jean-Étienne Guettard and Nicolas Desmarest hiked central France and recorded their observations on some of the first geological maps. Aided by chemical experimentation, naturalists such as Scotland's John Walker, Sweden's Torbern Bergman, and Germany's Abraham Werner created comprehensive classification systems for rocks and minerals—a collective achievement that transformed geology into a cutting edge field by the end of the eighteenth century. These early geologists also proposed a generalized interpretations of Earth history that led James Hutton, Georges Cuvier and Alexandre Brongniart, following in the steps of Steno, to argue that layers of rock could be dated by the fossils they contained: a principle first applied to the geology of the Paris Basin. The use of index fossils became a powerful tool for making geological maps, because it allowed geologists to correlate the rocks in one locality with those of similar age in other, distant localities.
+
+=== Birth of modern economics ===
+
+The basis for classical economics forms Adam Smith's An Inquiry into the Nature and Causes of the Wealth of Nations, published in 1776. Smith criticized mercantilism, advocating a system of free trade with division of labour. He postulated an "invisible hand" that regulated economic systems made up of actors guided only by self-interest. The "invisible hand" mentioned in a lost page in the middle of a chapter in the middle of the "Wealth of Nations", 1776, advances as Smith's central message.
+
+=== Social science ===
+Anthropology can best be understood as an outgrowth of the Age of Enlightenment. It was during this period that Europeans attempted systematically to study human behavior. Traditions of jurisprudence, history, philology and sociology developed during this time and informed the development of the social sciences of which anthropology was a part.
+
+== 19th century ==
+
+The 19th century saw the birth of science as a profession. William Whewell had coined the term scientist in 1833, which soon replaced the older term natural philosopher.
+
+=== Developments in physics ===
+
+In physics, the behavior of electricity and magnetism was studied by Giovanni Aldini, Alessandro Volta, Michael Faraday, Georg Ohm, and others. The experiments, theories and discoveries of Michael Faraday, Andre-Marie Ampere, James Clerk Maxwell, and their contemporaries led to the unification of the two phenomena into a single theory of electromagnetism as described by Maxwell's equations. Thermodynamics led to an understanding of heat and the notion of energy being defined.
+
+=== Discovery of Neptune ===
+In astronomy, the planet Neptune was discovered. Advances in astronomy and in optical systems in the 19th century resulted in the first observation of an asteroid (1 Ceres) in 1801, and the discovery of Neptune in 1846.

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+
+=== Developments in mathematics ===
+In mathematics, the notion of complex numbers finally matured and led to a subsequent analytical theory; they also began the use of hypercomplex numbers. Karl Weierstrass and others carried out the arithmetization of analysis for functions of real and complex variables. It also saw rise to new progress in geometry beyond those classical theories of Euclid, after a period of nearly two thousand years. The mathematical science of logic likewise had revolutionary breakthroughs after a similarly long period of stagnation. But the most important step in science at this time were the ideas formulated by the creators of electrical science. Their work changed the face of physics and made possible for new technology to come about such as electric power, electrical telegraphy, the telephone, and radio.
+
+=== Developments in chemistry ===
+
+In chemistry, Dmitri Mendeleev, following the atomic theory of John Dalton, created the first periodic table of elements. Other highlights include the discoveries unveiling the nature of atomic structure and matter, simultaneously with chemistry – and of new kinds of radiation. The theory that all matter is made of atoms, which are the smallest constituents of matter that cannot be broken down without losing the basic chemical and physical properties of that matter, was provided by John Dalton in 1803, although the question took a hundred years to settle as proven. Dalton also formulated the law of mass relationships. In 1869, Dmitri Mendeleev composed his periodic table of elements on the basis of Dalton's discoveries. The synthesis of urea by Friedrich Wöhler opened a new research field, organic chemistry, and by the end of the 19th century, scientists were able to synthesize hundreds of organic compounds. The later part of the 19th century saw the exploitation of the Earth's petrochemicals, after the exhaustion of the oil supply from whaling. By the 20th century, systematic production of refined materials provided a ready supply of products which provided not only energy, but also synthetic materials for clothing, medicine, and everyday disposable resources. Application of the techniques of organic chemistry to living organisms resulted in physiological chemistry, the precursor to biochemistry.
+
+=== Age of the Earth ===
+Over the first half of the 19th century, geologists such as Charles Lyell, Adam Sedgwick, and Roderick Murchison applied the new technique to rocks throughout Europe and eastern North America, setting the stage for more detailed, government-funded mapping projects in later decades. Midway through the 19th century, the focus of geology shifted from description and classification to attempts to understand how the surface of the Earth had changed. The first comprehensive theories of mountain building were proposed during this period, as were the first modern theories of earthquakes and volcanoes. Louis Agassiz and others established the reality of continent-covering ice ages, and "fluvialists" like Andrew Crombie Ramsay argued that river valleys were formed, over millions of years by the rivers that flow through them. After the discovery of radioactivity, radiometric dating methods were developed, starting in the 20th century. Alfred Wegener's theory of "continental drift" was widely dismissed when he proposed it in the 1910s, but new data gathered in the 1950s and 1960s led to the theory of plate tectonics, which provided a plausible mechanism for it. Plate tectonics also provided a unified explanation for a wide range of seemingly unrelated geological phenomena. Since the 1960s it has served as the unifying principle in geology.
+
+=== Evolution and inheritance ===
+
+Perhaps the most prominent, controversial, and far-reaching theory in all of science has been the theory of evolution by natural selection, which was independently formulated by Charles Darwin and Alfred Wallace. It was described in detail in Darwin's book The Origin of Species, which was published in 1859. In it, Darwin proposed that the features of all living things, including humans, were shaped by natural processes over long periods of time. The theory of evolution in its current form affects almost all areas of biology. Implications of evolution on fields outside of pure science have led to both opposition and support from different parts of society, and profoundly influenced the popular understanding of "man's place in the universe". Separately, Gregor Mendel formulated the principles of inheritance in 1866, which became the basis of modern genetics.
+
+=== Germ theory ===
+Another important landmark in medicine and biology were the successful efforts to prove the germ theory of disease. Following this, Louis Pasteur made the first vaccine against rabies, and also made many discoveries in the field of chemistry, including the asymmetry of crystals. In 1847, Hungarian physician Ignác Fülöp Semmelweis dramatically reduced the occurrence of puerperal fever by simply requiring physicians to wash their hands before attending to women in childbirth. This discovery predated the germ theory of disease. However, Semmelweis' findings were not appreciated by his contemporaries and handwashing came into use only with discoveries by British surgeon Joseph Lister, who in 1865 proved the principles of antisepsis. Lister's work was based on the important findings by French biologist Louis Pasteur. Pasteur was able to link microorganisms with disease, revolutionizing medicine. He also devised one of the most important methods in preventive medicine, when in 1880 he produced a vaccine against rabies. Pasteur invented the process of pasteurization, to help prevent the spread of disease through milk and other foods.
+
+=== Schools of economics ===
+Karl Marx developed an alternative economic theory, called Marxian economics. Marxian economics is based on the labor theory of value and assumes the value of good to be based on the amount of labor required to produce it. Under this axiom, capitalism was based on employers not paying the full value of workers labor to create profit. The Austrian School responded to Marxian economics by viewing entrepreneurship as driving force of economic development. This replaced the labor theory of value by a system of supply and demand.

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+
+=== Founding of psychology ===
+Psychology as a scientific enterprise that was independent from philosophy began in 1879 when Wilhelm Wundt founded the first laboratory dedicated exclusively to psychological research (in Leipzig). Other important early contributors to the field include Hermann Ebbinghaus (a pioneer in memory studies), Ivan Pavlov (who discovered classical conditioning), William James, and Sigmund Freud. Freud's influence has been enormous, though more as cultural icon than a force in scientific psychology.
+
+=== Modern sociology ===
+Modern sociology emerged in the early 19th century as the academic response to the modernization of the world. Among many early sociologists (e.g., Émile Durkheim), the aim of sociology was in structuralism, understanding the cohesion of social groups, and developing an "antidote" to social disintegration. Max Weber was concerned with the modernization of society through the concept of rationalization, which he believed would trap individuals in an "iron cage" of rational thought. Some sociologists, including Georg Simmel and W. E. B. Du Bois, used more microsociological, qualitative analyses. This microlevel approach played an important role in American sociology, with the theories of George Herbert Mead and his student Herbert Blumer resulting in the creation of the symbolic interactionism approach to sociology. In particular, just Auguste Comte, illustrated with his work the transition from a theological to a metaphysical stage and, from this, to a positive stage. Comte took care of the classification of the sciences as well as a transit of humanity towards a situation of progress attributable to a re-examination of nature according to the affirmation of 'sociality' as the basis of the scientifically interpreted society.
+
+=== Romanticism ===
+The Romantic Movement of the early 19th century reshaped science by opening up new pursuits unexpected in the classical approaches of the Enlightenment. The decline of Romanticism occurred because a new movement, Positivism, began to take hold of the ideals of the intellectuals after 1840 and lasted until about 1880. At the same time, the romantic reaction to the Enlightenment produced thinkers such as Johann Gottfried Herder and later Wilhelm Dilthey whose work formed the basis for the culture concept which is central to the discipline. Traditionally, much of the history of the subject was based on colonial encounters between Western Europe and the rest of the world, and much of 18th- and 19th-century anthropology is now classed as scientific racism. During the late 19th century, battles over the "study of man" took place between those of an "anthropological" persuasion (relying on anthropometrical techniques) and those of an "ethnological" persuasion (looking at cultures and traditions), and these distinctions became part of the later divide between physical anthropology and cultural anthropology, the latter ushered in by the students of Franz Boas.
+
+== 20th century ==
+
+Science advanced dramatically during the 20th century. There were new and radical developments in the physical and life sciences, building on the progress from the 19th century.
+
+=== Theory of relativity and quantum mechanics ===
+
+The beginning of the 20th century brought the start of a revolution in physics. The long-held theories of Newton were shown not to be correct in all circumstances. Beginning in 1900, Max Planck, Albert Einstein, Niels Bohr and others developed quantum theories to explain various anomalous experimental results, by introducing discrete energy levels. Not only did quantum mechanics show that the laws of motion did not hold on small scales, but the theory of general relativity, proposed by Einstein in 1915, showed that the fixed background of spacetime, on which both Newtonian mechanics and special relativity depended, could not exist. In 1925, Werner Heisenberg and Erwin Schrödinger formulated quantum mechanics, which explained the preceding quantum theories. Currently, general relativity and quantum mechanics are inconsistent with each other, and efforts are underway to unify the two.
+
+=== Big Bang ===
+The observation by Edwin Hubble in 1929 that the speed at which galaxies recede positively correlates with their distance, led to the understanding that the universe is expanding, and the formulation of the Big Bang theory by Georges Lemaître. George Gamow, Ralph Alpher, and Robert Herman had calculated that there should be evidence for a Big Bang in the background temperature of the universe. In 1964, Arno Penzias and Robert Wilson discovered a 3 Kelvin background hiss in their Bell Labs radiotelescope (the Holmdel Horn Antenna), which was evidence for this hypothesis, and formed the basis for a number of results that helped determine the age of the universe.
+
+=== Big science ===
+
+In 1938 Otto Hahn and Fritz Strassmann discovered nuclear fission with radiochemical methods, and in 1939 Lise Meitner and Otto Robert Frisch wrote the first theoretical interpretation of the fission process, which was later improved by Niels Bohr and John A. Wheeler. Further developments took place during World War II, which led to the practical application of radar and the development and use of the atomic bomb. Around this time, Chien-Shiung Wu was recruited by the Manhattan Project to help develop a process for separating uranium metal into U-235 and U-238 isotopes by Gaseous diffusion. She was an expert experimentalist in beta decay and weak interaction physics. Wu designed an experiment (see Wu experiment) that enabled theoretical physicists Tsung-Dao Lee and Chen-Ning Yang to disprove the law of parity experimentally, winning them a Nobel Prize in 1957.
+Though the process had begun with the invention of the cyclotron by Ernest O. Lawrence in the 1930s, physics in the postwar period entered into a phase of what historians have called "Big Science", requiring massive machines, budgets, and laboratories in order to test their theories and move into new frontiers. The primary patron of physics became state governments, who recognized that the support of "basic" research could often lead to technologies useful to both military and industrial applications.
+
+=== Advances in genetics ===

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+
+In the early 20th century, the study of heredity became a major investigation after the rediscovery in 1900 of the laws of inheritance developed by Mendel. The 20th century also saw the integration of physics and chemistry, with chemical properties explained as the result of the electronic structure of the atom. Linus Pauling's book on The Nature of the Chemical Bond used the principles of quantum mechanics to deduce bond angles in ever-more complicated molecules. Pauling's work culminated in the physical modelling of DNA, the secret of life (in the words of Francis Crick, 1953). In the same year, the Miller–Urey experiment demonstrated in a simulation of primordial processes, that basic constituents of proteins, simple amino acids, could themselves be built up from simpler molecules, kickstarting decades of research into the chemical origins of life. By 1953, James D. Watson and Francis Crick clarified the basic structure of DNA, the genetic material for expressing life in all its forms, building on the work of Maurice Wilkins and Rosalind Franklin, suggested that the structure of DNA was a double helix. In their famous paper "Molecular structure of Nucleic Acids" In the late 20th century, the possibilities of genetic engineering became practical for the first time, and a massive international effort began in 1990 to map out an entire human genome (the Human Genome Project). The discipline of ecology typically traces its origin to the synthesis of Darwinian evolution and Humboldtian biogeography, in the late 19th and early 20th centuries. Equally important in the rise of ecology, however, were microbiology and soil science—particularly the cycle of life concept, prominent in the work of Louis Pasteur and Ferdinand Cohn. The word ecology was coined by Ernst Haeckel, whose particularly holistic view of nature in general (and Darwin's theory in particular) was important in the spread of ecological thinking. The field of ecosystem ecology emerged in the Atomic Age with the use of radioisotopes to visualize food webs and by the 1970s ecosystem ecology deeply influenced global environmental management.
+
+=== Space exploration ===
+In 1925, Cecilia Payne-Gaposchkin determined that stars were composed mostly of hydrogen and helium. She was dissuaded by astronomer Henry Norris Russell from publishing this finding in her PhD thesis because of the widely held belief that stars had the same composition as the Earth. However, four years later, in 1929, Henry Norris Russell came to the same conclusion through different reasoning and the discovery was eventually accepted.
+In 1987, supernova SN 1987A was observed by astronomers on Earth both visually, and in a triumph for neutrino astronomy, by the solar neutrino detectors at Kamiokande. But the solar neutrino flux was a fraction of its theoretically expected value. This discrepancy forced a change in some values in the Standard Model for particle physics.
+
+=== Neuroscience as a distinct discipline ===
+The understanding of neurons and the nervous system became increasingly precise and molecular during the 20th century. For example, in 1952, Alan Lloyd Hodgkin and Andrew Huxley presented a mathematical model for transmission of electrical signals in neurons of the giant axon of a squid, which they called "action potentials", and how they are initiated and propagated, known as the Hodgkin–Huxley model. In 1961–1962, Richard FitzHugh and J. Nagumo simplified Hodgkin–Huxley, in what is called the FitzHugh–Nagumo model. In 1962, Bernard Katz modeled neurotransmission across the space between neurons known as synapses. Beginning in 1966, Eric Kandel and collaborators examined biochemical changes in neurons associated with learning and memory storage in Aplysia. In 1981 Catherine Morris and Harold Lecar combined these models in the Morris–Lecar model. Such increasingly quantitative work gave rise to numerous biological neuron models and models of neural computation. Neuroscience began to be recognized as a distinct academic discipline in its own right. Eric Kandel and collaborators have cited David Rioch, Francis O. Schmitt, and Stephen Kuffler as having played critical roles in establishing the field.
+
+=== Plate tectonics ===
+
+Geologists' embrace of plate tectonics became part of a broadening of the field from a study of rocks into a study of the Earth as a planet. Other elements of this transformation include: geophysical studies of the interior of the Earth, the grouping of geology with meteorology and oceanography as one of the "earth sciences", and comparisons of Earth and the solar system's other rocky planets.

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+title: "History of science"
+chunk: 18/19
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+category: "reference"
+tags: "science, encyclopedia"
+date_saved: "2026-05-05T03:10:13.353605+00:00"
+instance: "kb-cron"
+---
+
+=== Applications ===
+In terms of applications, a massive number of new technologies were developed in the 20th century. Technologies such as electricity, the incandescent light bulb, the automobile and the phonograph, first developed at the end of the 19th century, were perfected and universally deployed. The first car was introduced by Karl Benz in 1885. The first airplane flight occurred in 1903, and by the end of the century airliners flew thousands of miles in a matter of hours. The development of the radio, television and computers caused massive changes in the dissemination of information. Advances in biology also led to large increases in food production, as well as the elimination of diseases such as polio by Dr. Jonas Salk. Gene mapping and gene sequencing, invented by Drs. Mark Skolnik and Walter Gilbert, respectively, are the two technologies that made the Human Genome Project feasible. Computer science, built upon a foundation of theoretical linguistics, discrete mathematics, and electrical engineering, studies the nature and limits of computation. Subfields include computability, computational complexity, database design, computer networking, artificial intelligence, and the design of computer hardware. One area in which advances in computing have contributed to more general scientific development is by facilitating large-scale archiving of scientific data. Contemporary computer science typically distinguishes itself by emphasizing mathematical 'theory' in contrast to the practical emphasis of software engineering.
+Einstein's paper "On the Quantum Theory of Radiation" outlined the principles of the stimulated emission of photons. This led to the invention of the Laser (light amplification by the stimulated emission of radiation) and the optical amplifier which ushered in the Information Age. It is optical amplification that allows fiber optic networks to transmit the massive capacity of the Internet.
+Based on wireless transmission of electromagnetic radiation and global networks of cellular operation, the mobile phone became a primary means to access the internet.
+
+=== Developments in political science and economics ===
+In political science during the 20th century, the study of ideology, behaviouralism and international relations led to a multitude of 'pol-sci' subdisciplines including rational choice theory, voting theory, game theory (also used in economics), psephology, political geography/geopolitics, political anthropology/political psychology/political sociology, political economy, policy analysis, public administration, comparative political analysis and peace studies/conflict analysis. In economics, John Maynard Keynes prompted a division between microeconomics and macroeconomics in the 1920s. Under Keynesian economics macroeconomic trends can overwhelm economic choices made by individuals. Governments should promote aggregate demand for goods as a means to encourage economic expansion. Following World War II, Milton Friedman created the concept of monetarism. Monetarism focuses on using the supply and demand of money as a method for controlling economic activity. In the 1970s, monetarism has adapted into supply-side economics which advocates reducing taxes as a means to increase the amount of money available for economic expansion. Other modern schools of economic thought are New Classical economics and New Keynesian economics. New Classical economics was developed in the 1970s, emphasizing solid microeconomics as the basis for macroeconomic growth. New Keynesian economics was created partially in response to New Classical economics. It shows how imperfect competition and market rigidities, means monetary policy has real effects, and enables analysis of different policies.
+
+=== Developments in psychology, sociology, and anthropology ===
+Psychology in the 20th century saw a rejection of Freud's theories as being too unscientific, and a reaction against Edward Titchener's atomistic approach of the mind. This led to the formulation of behaviorism by John B. Watson, which was popularized by B.F. Skinner. Behaviorism proposed epistemologically limiting psychological study to overt behavior, since that could be reliably measured. Scientific knowledge of the "mind" was considered too metaphysical, hence impossible to achieve. The final decades of the 20th century have seen the rise of cognitive science, which considers the mind as once again a subject for investigation, using the tools of psychology, linguistics, computer science, philosophy, and neurobiology. New methods of visualizing the activity of the brain, such as PET scans and CAT scans, began to exert their influence as well, leading some researchers to investigate the mind by investigating the brain, rather than cognition. These new forms of investigation assume that a wide understanding of the human mind is possible, and that such an understanding may be applied to other research domains, such as artificial intelligence. Evolutionary theory was applied to behavior and introduced to anthropology and psychology, through the works of cultural anthropologist Napoleon Chagnon. Physical anthropology would become biological anthropology, incorporating elements of evolutionary biology.
+American sociology in the 1940s and 1950s was dominated largely by Talcott Parsons, who argued that aspects of society that promoted structural integration were therefore "functional". This structural functionalism approach was questioned in the 1960s, when sociologists came to see this approach as merely a justification for inequalities present in the status quo. In reaction, conflict theory was developed, which was based in part on the philosophies of Karl Marx. Conflict theorists saw society as an arena in which different groups compete for control over resources. Symbolic interactionism also came to be regarded as central to sociological thinking. Erving Goffman saw social interactions as a stage performance, with individuals preparing "backstage" and attempting to control their audience through impression management. While these theories are currently prominent in sociological thought, other approaches exist, including feminist theory, post-structuralism, rational choice theory, and postmodernism.
+In the mid-20th century, much of the methodologies of earlier anthropological and ethnographical study were reevaluated with an eye towards research ethics, while at the same time the scope of investigation has broadened far beyond the traditional study of "primitive cultures".

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+---
+title: "History of science"
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+category: "reference"
+tags: "science, encyclopedia"
+date_saved: "2026-05-05T03:10:13.353605+00:00"
+instance: "kb-cron"
+---
+
+== 21st century ==
+In the early 21st century, some concepts that originated in 20th century physics were proven. On 4 July 2012, physicists working at CERN's Large Hadron Collider announced that they had discovered a new subatomic particle greatly resembling the Higgs boson, confirmed as such by the following March. Gravitational waves were first detected by astronomers at the Laser Interferometer Gravitational-Wave Observatory on 14 September 2015. One of the first direct images of a black hole, taken by the Event Horizon Telescope in April of 2017, was released to the public on April 10, 2019.
+The Human Genome Project was declared complete in 2003. The CRISPR gene editing technique developed in 2012 allowed scientists to precisely and easily modify DNA in living organisms and led to the development of new medicine. Advances in synthetic biology with computer assistance led to the creation of artificial microbial life, such as JCVI-syn3.0 in 2016 and xenobots in 2020.
+Positive psychology is a branch of psychology founded in 1998 by Martin Seligman that is concerned with the study of happiness, mental well-being, and positive human functioning, and is a reaction to 20th century psychology's emphasis on mental illness and dysfunction. Starting around 2011, a replication crisis affected some branches of the social sciences.
+
+== See also ==
+
+== References ==
+
+=== Sources ===
+Bruno, Leonard C. (1989). The Landmarks of Science. Facts on File. ISBN 978-0-8160-2137-6.
+Heilbron, John L., ed. (2003). The Oxford Companion to the History of Modern Science. Oxford University Press. ISBN 978-0-19-511229-0.
+Needham, Joseph; Wang, Ling (1954). Introductory Orientations. Science and Civilisation in China. Vol. 1. Cambridge University Press.
+Needham, Joseph (1986a). Mathematics and the Sciences of the Heavens and the Earth. Science and Civilisation in China. Vol. 3. Taipei: Caves Books Ltd.
+Needham, Joseph (1986c). Physics and Physical Technology, Part 2, Mechanical Engineering. Science and Civilisation in China. Vol. 4. Taipei: Caves Books Ltd.
+Needham, Joseph; Robinson, Kenneth G.; Huang, Jen-Yü (2004). "General Conclusions and Reflections". Science and Chinese society. Science and Civilisation in China. Vol. 7. Cambridge University Press.
+Sambursky, Shmuel (1974). Physical Thought from the Presocratics to the Quantum Physicists: an anthology selected, introduced and edited by Shmuel Sambursky. Pica Press. p. 584. ISBN 978-0-87663-712-8.
+Strathern, Paul (2023). The Other Renaissance: From Copernicus to Shakespeare: How the Renaissance in Northern Europe Transformed the World. New York: Pegasus Books. ISBN 978-1-63936-393-3.
+Wootton, David (2015). The Invention of Science: A New History of the Scientific Revolution. New York: Harper, an imprint of HarperCollins Publishers. ISBN 978-0-06-175952-9.
+
+== Further reading ==
+
+== External links ==
+
+'What is the History of Science', British Academy
+British Society for the History of Science
+Fieser, James; Dowden, Bradley (eds.). "Scientific Change". Internet Encyclopedia of Philosophy. ISSN 2161-0002. OCLC 37741658.
+The CNRS History of Science and Technology Research Center in Paris (France) (in French)
+Henry Smith Williams, History of Science, Vols 1–4, online text
+Digital Archives of the National Institute of Standards and Technology (NIST)
+Digital facsimiles of books from the History of Science Collection Archived 13 January 2020 at the Wayback Machine, Linda Hall Library Digital Collections
+Division of History of Science and Technology of the International Union of History and Philosophy of Science
+Giants of Science (website of the Institute of National Remembrance)
+History of Science Digital Collection: Utah State University – Contains primary sources by such major figures in the history of scientific inquiry as Otto Brunfels, Charles Darwin, Erasmus Darwin, Carolus Linnaeus Antony van Leeuwenhoek, Jan Swammerdam, James Sowerby, Andreas Vesalius, and others.
+History of Science Society ("HSS") Archived 15 September 2020 at the Wayback Machine
+Inter-Divisional Teaching Commission (IDTC) of the International Union for the History and Philosophy of Science (IUHPS) Archived 13 January 2020 at the Wayback Machine
+International Academy of the History of Science
+International History, Philosophy and Science Teaching Group
+IsisCB Explore: History of Science Index An open access discovery tool
+Museo Galileo – Institute and Museum of the History of Science in Florence, Italy
+National Center for Atmospheric Research (NCAR) Archives
+The official site of the Nobel Foundation. Features biographies and info on Nobel laureates
+The Royal Society, trailblazing science from 1650 to date Archived 18 August 2015 at the Wayback Machine
+The Vega Science Trust Free to view videos of scientists including Feynman, Perutz, Rotblat, Born and many Nobel Laureates.
+A Century of Science in America: with special reference to the American Journal of Science, 1818-1918

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+title: "History of science"
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+category: "reference"
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+date_saved: "2026-05-05T03:10:13.353605+00:00"
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+---
+
+The ancient Mesopotamians had extensive knowledge about the chemical properties of clay, sand, metal ore, bitumen, stone, and other natural materials, and applied this knowledge to practical use in manufacturing pottery, faience, glass, soap, metals, lime plaster, and waterproofing. Metallurgy required knowledge about the properties of metals. Nonetheless, the Mesopotamians seem to have had little interest in gathering information about the natural world for the mere sake of gathering information and were far more interested in studying the manner in which the gods had ordered the universe. Biology of non-human organisms was generally only written about in the context of mainstream academic disciplines. Animal physiology was studied extensively for the purpose of divination; the anatomy of the liver, which was seen as an important organ in haruspicy, was studied in particularly intensive detail. Animal behavior was also studied for divinatory purposes. Most information about the training and domestication of animals was probably transmitted orally without being written down, but one text dealing with the training of horses has survived.
+
+==== Mesopotamian medicine ====
+The ancient Mesopotamians had no distinction between "rational science" and magic. When a person became ill, doctors prescribed magical formulas to be recited as well as medicinal treatments. The earliest medical prescriptions appear in Sumerian during the Third Dynasty of Ur (c. 2112 BCE – c. 2004 BCE). The most extensive Babylonian medical text, however, is the Diagnostic Handbook written by the ummânū, or chief scholar, Esagil-kin-apli of Borsippa, during the reign of the Babylonian king Adad-apla-iddina (1069–1046 BCE). In East Semitic cultures, the main medicinal authority was a kind of exorcist-healer known as an āšipu. The profession was generally passed down from father to son and was held in extremely high regard. Of less frequent recourse was another kind of healer known as an asu, who corresponds more closely to a modern physician and treated physical symptoms using primarily folk remedies composed of various herbs, animal products, and minerals, as well as potions, enemas, and ointments or poultices. These physicians, who could be either male or female, also dressed wounds, set limbs, and performed simple surgeries. The ancient Mesopotamians also practiced prophylaxis and took measures to prevent the spread of disease.
+
+==== Astronomy and celestial divination ====
+
+In Babylonian astronomy, records of the motions of the stars, planets, and the moon are left on thousands of clay tablets created by scribes. Even today, astronomical periods identified by Mesopotamian proto-scientists are still widely used in Western calendars such as the solar year and the lunar month. Using this data, they developed mathematical methods to compute the changing length of daylight in the course of the year, predict the appearances and disappearances of the Moon and planets, and eclipses of the Sun and Moon. Only a few astronomers' names are known, such as that of Kidinnu, a Chaldean astronomer and mathematician. Kiddinu's value for the solar year is in use for today's calendars. Babylonian astronomy was "the first and highly successful attempt at giving a refined mathematical description of astronomical phenomena." According to the historian A. Aaboe, "all subsequent varieties of scientific astronomy, in the Hellenistic world, in India, in Islam, and in the West—if not indeed all subsequent endeavour in the exact sciences—depend upon Babylonian astronomy in decisive and fundamental ways."
+To the Babylonians and other Near Eastern cultures, messages from the gods or omens were concealed in all natural phenomena that could be deciphered and interpreted by those who are adept. Hence, it was believed that the gods could speak through all terrestrial objects (e.g., animal entrails, dreams, malformed births, or even the color of a dog urinating on a person) and celestial phenomena. Moreover, Babylonian astrology was inseparable from Babylonian astronomy.
+
+==== Mathematics ====
+The Mesopotamian cuneiform tablet Plimpton 322, dating to the 18th century BCE, records a number of Pythagorean triplets (3, 4, 5) and (5, 12, 13) ..., hinting that the ancient Mesopotamians might have been aware of the Pythagorean theorem over a millennium before Pythagoras.
+
+== Ancient and medieval South Asia and East Asia ==
+
+Mathematical achievements from Mesopotamia had some influence on the development of mathematics in India, and there were confirmed transmissions of mathematical ideas between India and China, which were bidirectional. Nevertheless, the mathematical and scientific achievements in India and particularly in China occurred largely independently from those of Europe and the confirmed early influences that these two civilizations had on the development of science in Europe in the pre-modern era were indirect, with Mesopotamia and later the Islamic World acting as intermediaries. The arrival of modern science, which grew out of the Scientific Revolution, in India and China and the greater Asian region in general can be traced to the scientific activities of Jesuit missionaries who were interested in studying the region's flora and fauna during the 16th to 17th century.
+
+=== India ===
+
+==== Mathematics ====

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+title: "History of science"
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+date_saved: "2026-05-05T03:10:13.353605+00:00"
+instance: "kb-cron"
+---
+
+The earliest traces of mathematical knowledge in the Indian subcontinent appear with the Indus Valley Civilisation (c. 3300 – c. 1300 BCE). The people of this civilization made bricks whose dimensions were in the proportion 4:2:1, which is favorable for the stability of a brick structure. They also tried to standardize measurement of length to a high degree of accuracy. They designed a ruler—the Mohenjo-daro ruler—whose length of approximately 1.32 in (34 mm) was divided into ten equal parts. Bricks manufactured in ancient Mohenjo-daro often had dimensions that were integral multiples of this unit of length.
+The Bakhshali manuscript contains problems involving arithmetic, algebra and geometry, including mensuration. The topics covered include fractions, square roots, arithmetic and geometric progressions, solutions of simple equations, simultaneous linear equations, quadratic equations and indeterminate equations of the second degree. In the 3rd century BCE, Pingala presents the Pingala-sutras,  the earliest known treatise on Sanskrit prosody. He also presents a numerical system by adding one to the sum of place values. Pingala's work also includes material related to the Fibonacci numbers, called mātrāmeru.
+Indian astronomer and mathematician Aryabhata (476–550), in his Aryabhatiya (499) introduced the sine function in trigonometry and the number 0. In 628, Brahmagupta suggested that gravity was a force of attraction. He also lucidly explained the use of zero as both a placeholder and a decimal digit, along with the Hindu–Arabic numeral system now used universally throughout the world. Arabic translations of the two astronomers' texts were soon available in the Islamic world, introducing what would become Arabic numerals to the Islamic world by the 9th century.
+Narayana Pandita (1340–1400) was an Indian mathematician. Plofker writes that his texts were the most significant Sanskrit mathematics treatises after those of Bhaskara II, other than the Kerala school. He wrote the Ganita Kaumudi (lit. "Moonlight of mathematics") in 1356 about mathematical operations. The work anticipated many developments in combinatorics.
+Between the 14th and 16th centuries, the Kerala school of astronomy and mathematics made significant advances in astronomy and especially mathematics, including fields such as trigonometry and analysis. In particular, Madhava of Sangamagrama led advancement in analysis by providing the infinite and taylor series expansion of some trigonometric functions and pi approximation.  Parameshvara (1380–1460), presents a case of the Mean Value theorem in his commentaries on Govindasvāmi and Bhāskara II. The Yuktibhāṣā  was written by Jyeshtadeva in 1530.
+
+==== Astronomy ====
+
+The first textual mention of astronomical concepts comes from the Vedas, religious literature of India. According to Sarma (2008): "One finds in the Rigveda intelligent speculations about the genesis of the universe from nonexistence, the configuration of the universe, the spherical self-supporting earth, and the year of 360 days divided into 12 equal parts of 30 days each with a periodical intercalary month.".
+The first 12 chapters of the Siddhanta Shiromani, written by Bhāskara in the 12th century, cover topics such as: mean longitudes of the planets; true longitudes of the planets; the three problems of diurnal rotation; syzygies; lunar eclipses; solar eclipses; latitudes of the planets; risings and settings; the moon's crescent; conjunctions of the planets with each other; conjunctions of the planets with the fixed stars; and the patas of the sun and moon. The 13 chapters of the second part cover the nature of the sphere, as well as significant astronomical and trigonometric calculations based on it.
+In the Tantrasangraha treatise, Nilakantha Somayaji's updated the Aryabhatan model for the interior planets, Mercury, and Venus and the equation that he specified for the center of these planets was more accurate than the ones in European or Islamic astronomy until the time of Johannes Kepler in the 17th century. Jai Singh II of Jaipur constructed five observatories called Jantar Mantars in total, in New Delhi, Jaipur, Ujjain, Mathura and Varanasi; they were completed between 1724 and 1735.
+
+==== Grammar ====
+Some of the earliest linguistic activities can be found in Iron Age India (1st millennium BCE) with the analysis of Sanskrit for the purpose of the correct recitation and interpretation of Vedic texts. The most notable grammarian of Sanskrit was Pāṇini (c. 520–460 BCE), whose grammar formulates close to 4,000 rules for Sanskrit. Inherent in his analytic approach are the concepts of the phoneme, the morpheme and the root. The Tolkāppiyam text, composed in the early centuries of the common era, is a comprehensive text on Tamil grammar, which includes sutras on orthography, phonology, etymology, morphology, semantics, prosody, sentence structure and the significance of context in language.
+
+==== Medicine ====
+
+Findings from Neolithic graveyards in what is now Pakistan show evidence of proto-dentistry among an early farming culture. The ancient text Suśrutasamhitā of Suśruta describes procedures on various forms of surgery, including rhinoplasty, the repair of torn ear lobes, perineal lithotomy, cataract surgery, and several other excisions and other surgical procedures. The Charaka Samhita of Charaka describes ancient theories on human body, etiology, symptomology and therapeutics for a wide range of diseases. It also includes sections on the importance of diet, hygiene, prevention, medical education, and the teamwork of a physician, nurse and patient necessary for recovery to health.
+
+==== Politics and state ====
+An ancient Indian treatise on statecraft, economic policy and military strategy by Kautilya and Viṣhṇugupta, who are traditionally identified with Chāṇakya (c. 350–283 BCE). In this treatise, the behaviors and relationships of the people, the King, the State, the Government Superintendents, Courtiers, Enemies, Invaders, and Corporations are analyzed and documented. Roger Boesche describes the Arthaśāstra as "a book of political realism, a book analyzing how the political world does work and not very often stating how it ought to work, a book that frequently discloses to a king what calculating and sometimes brutal measures he must carry out to preserve the state and the common good."

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+title: "History of science"
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+category: "reference"
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+date_saved: "2026-05-05T03:10:13.353605+00:00"
+instance: "kb-cron"
+---
+
+==== Logic ====
+The development of Indian logic dates back to the Chandahsutra of Pingala and anviksiki of Medhatithi Gautama (c. 6th century BCE); the Sanskrit grammar rules of Pāṇini (c. 5th century BCE); the Vaisheshika school's analysis of atomism (c. 6th century BCE to 2nd century BCE); the analysis of inference by Gotama (c. 6th century BCE to 2nd century CE), founder of the Nyaya school of Hindu philosophy; and the tetralemma of Nagarjuna (c. 2nd century CE).
+Indian logic stands as one of the three original traditions of logic, alongside the Greek and the Chinese logic. The Indian tradition continued to develop through early to modern times, in the form of the Navya-Nyāya school of logic.
+In the 2nd century, the Buddhist philosopher Nagarjuna refined the Catuskoti form of logic. The Catuskoti is also often glossed Tetralemma (Greek)  which is the name for a largely comparable, but not equatable, 'four corner argument' within the tradition of Classical logic.
+Navya-Nyāya developed a sophisticated language and conceptual scheme that allowed it to raise, analyse, and solve problems in logic and epistemology. It systematised all the Nyāya concepts into four main categories: sense or perception (pratyakşa), inference (anumāna), comparison or similarity (upamāna), and testimony (sound or word; śabda).
+
+=== China ===
+
+==== Chinese mathematics ====
+
+From the earliest the Chinese used a positional decimal system on counting boards in order to calculate. To express 10, a single rod is placed in the second box from the right. The spoken language uses a similar system to English: e.g. four thousand two hundred and seven. No symbol was used for zero. By the 1st century BCE, negative numbers and decimal fractions were in use and The Nine Chapters on the Mathematical Art included methods for extracting higher order roots by Horner's method and solving linear equations and by Pythagoras' theorem. Cubic equations were solved in the Tang dynasty and solutions of equations of order higher than 3 appeared in print in 1245 CE by Ch'in Chiu-shao. Pascal's triangle for binomial coefficients was described around 1100 by Jia Xian.
+Although the first attempts at an axiomatization of geometry appear in the Mohist canon in 330 BCE, Liu Hui developed algebraic methods in geometry in the 3rd century CE and also calculated pi to 5 significant figures. In 480, Zu Chongzhi improved this by discovering the ratio 
+  
+    
+      
+        
+          
+            
+              355
+              113
+            
+          
+        
+      
+    
+    {\displaystyle {\tfrac {355}{113}}}
+  
+ which remained the most accurate value for 1200 years.
+
+==== Astronomical observations ====
+
+Astronomical observations from China constitute the longest continuous sequence from any civilization and include records of sunspots (112 records from 364 BCE), supernovas (1054), lunar and solar eclipses. By the 12th century, they could reasonably accurately make predictions of eclipses, but the knowledge of this was lost during the Ming dynasty, so that the Jesuit Matteo Ricci gained much favor in 1601 by his predictions. By 635 Chinese astronomers had observed that the tails of comets always point away from the sun.
+From antiquity, the Chinese used an equatorial system for describing the skies and a star map from 940 was drawn using a cylindrical (Mercator) projection. The use of an armillary sphere is recorded from the 4th century BCE and a sphere permanently mounted in equatorial axis from 52 BCE. In 125 CE Zhang Heng used water power to rotate the sphere in real time. This included rings for the meridian and ecliptic. By 1270 they had incorporated the principles of the Arab torquetum.
+In the Song Empire (960–1279) of Imperial China, Chinese scholar-officials unearthed, studied, and cataloged ancient artifacts.
+
+==== Inventions ====

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+title: "History of science"
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+
+To better prepare for calamities, Zhang Heng invented a seismometer in 132 CE which provided instant alert to authorities in the capital Luoyang that an earthquake had occurred in a location indicated by a specific cardinal or ordinal direction. Although no tremors could be felt in the capital when Zhang told the court that an earthquake had just occurred in the northwest, a message came soon afterwards that an earthquake had indeed struck 400 to 500 km (250 to 310 mi) northwest of Luoyang (in what is now modern Gansu). Zhang called his device the 'instrument for measuring the seasonal winds and the movements of the Earth' (Houfeng didong yi 候风地动仪), so-named because he and others thought that earthquakes were most likely caused by the enormous compression of trapped air.
+There are many notable contributors to early Chinese disciplines, inventions, and practices throughout the ages. One of the best examples would be the medieval Song Chinese Shen Kuo (1031–1095), a polymath and statesman who was the first to describe the magnetic-needle compass used for navigation, discovered the concept of true north, improved the design of the astronomical gnomon, armillary sphere, sight tube, and clepsydra, and described the use of drydocks to repair boats. After observing the natural process of the inundation of silt and the find of marine fossils in the Taihang Mountains (hundreds of miles from the Pacific Ocean), Shen Kuo devised a theory of land formation, or geomorphology. He also adopted a theory of gradual climate change in regions over time, after observing petrified bamboo found underground at Yan'an, Shaanxi. If not for Shen Kuo's writing, the architectural works of Yu Hao would be little known, along with the inventor of movable type printing, Bi Sheng (990–1051). Shen's contemporary Su Song (1020–1101) was also a brilliant polymath, an astronomer who created a celestial atlas of star maps, wrote a treatise related to botany, zoology, mineralogy, and metallurgy, and had erected a large astronomical clocktower in Kaifeng city in 1088. To operate the crowning armillary sphere, his clocktower featured an escapement mechanism and the world's oldest known use of an endless power-transmitting chain drive.
+The Jesuit China missions of the 16th and 17th centuries "learned to appreciate the scientific achievements of this ancient culture and made them known in Europe. Through their correspondence European scientists first learned about the Chinese science and culture." Western academic thought on the history of Chinese technology and science was galvanized by the work of Joseph Needham and the Needham Research Institute. Among the technological accomplishments of China were, according to the British scholar Needham, the water-powered celestial globe (Zhang Heng), dry docks, sliding calipers, the double-action piston pump, the blast furnace, the multi-tube seed drill, the wheelbarrow, the suspension bridge, the winnowing machine, gunpowder, the raised-relief map, toilet paper, the efficient harness, along with contributions in logic, astronomy, medicine, and other fields.
+However, cultural factors prevented these Chinese achievements from developing into "modern science". According to Needham, it may have been the religious and philosophical framework of Chinese intellectuals which made them unable to accept the ideas of laws of nature:
+
+It was not that there was no order in nature for the Chinese, but rather that it was not an order ordained by a rational personal being, and hence there was no conviction that rational personal beings would be able to spell out in their lesser earthly languages the divine code of laws which he had decreed aforetime. The Taoists, indeed, would have scorned such an idea as being too naïve for the subtlety and complexity of the universe as they intuited it. 
+
+== Pre-Columbian Mesoamerica ==
+
+During the Middle Formative Period (c. 900 BCE – c. 300 BCE) of Pre-Columbian Mesoamerica, the Zapotec civilization, heavily influenced by the Olmec civilization, established the first known full writing system of the region (possibly predated by the Olmec Cascajal Block), as well as the first known astronomical calendar in Mesoamerica. Following a period of initial urban development in the Preclassical period, the Classic Maya civilization (c. 250 CE – c. 900 CE) built on the shared heritage of the Olmecs by developing the most sophisticated systems of writing, astronomy, calendrical science, and mathematics among Mesoamerican peoples. The Maya developed a positional numeral system with a base of 20 that included the use of zero for constructing their calendars. Maya writing, which was developed by 200 BCE, widespread by 100 BCE, and rooted in Olmec and Zapotec scripts, contains easily discernible calendar dates in the form of logographs representing numbers, coefficients, and calendar periods amounting to 20 days and even 20 years for tracking social, religious, political, and economic events in 360-day years.
+
+== Classical antiquity and Greco-Roman natural philosophy ==
+
+The contributions of the Ancient Egyptians and Mesopotamians in the areas of astronomy, mathematics, and medicine had entered and shaped Greek natural philosophy of classical antiquity, whereby formal attempts were made to provide explanations of events in the physical world based on natural causes. Inquiries were also aimed at such practical goals such as establishing a reliable calendar or determining how to cure a variety of illnesses. The ancient people who were considered the first scientists may have thought of themselves as natural philosophers, as practitioners of a skilled profession (for example, physicians), or as followers of a religious tradition (for example, temple healers).

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+---
+title: "History of science"
+chunk: 7/19
+source: "https://en.wikipedia.org/wiki/History_of_science"
+category: "reference"
+tags: "science, encyclopedia"
+date_saved: "2026-05-05T03:10:13.353605+00:00"
+instance: "kb-cron"
+---
+
+=== Pre-socratics ===
+The earliest Greek philosophers, known as the pre-Socratics, provided competing answers to the question found in the myths of their neighbors: "How did the ordered cosmos in which we live come to be?" The pre-Socratic philosopher Thales (640–546 BCE) of Miletus, identified by later authors such as Aristotle as the first of the Ionian philosophers, postulated non-supernatural explanations for natural phenomena. For example, that land floats on water and that earthquakes are caused by the agitation of the water upon which the land floats, rather than the god Poseidon. Thales' student Pythagoras of Samos founded the Pythagorean school, which investigated mathematics for its own sake, and was the first to postulate that the Earth is spherical in shape. Leucippus (5th century BCE) introduced atomism, the theory that all matter is made of indivisible, imperishable units called atoms. This was greatly expanded on by his pupil Democritus and later Epicurus.
+
+=== Plato and Aristotle ===
+
+Plato and Aristotle produced the first systematic discussions of natural philosophy, which did much to shape later investigations of nature. Their development of deductive reasoning was of particular importance and usefulness to later scientific inquiry. Plato founded the Platonic Academy in 387 BCE, whose motto was "Let none unversed in geometry enter here," and also turned out many notable philosophers. Plato's student Aristotle introduced empiricism and the notion that universal truths can be arrived at via observation and induction, thereby laying the foundations of the scientific method. Aristotle also produced many biological writings that were empirical in nature, focusing on biological causation and the diversity of life. He made countless observations of nature, especially the habits and attributes of plants and animals on Lesbos, classified more than 540 animal species, and dissected at least 50. Aristotle's writings profoundly influenced subsequent Islamic and European scholarship, though they were eventually superseded in the Scientific Revolution.
+Aristotle also contributed to theories of the elements and the cosmos. He believed that the celestial bodies (such as the planets and the Sun) had something called an unmoved mover that put the celestial bodies in motion. Aristotle tried to explain everything through mathematics and physics, but sometimes explained things such as the motion of celestial bodies through a higher power such as God. Aristotle did not have the technological advancements that would have explained the motion of celestial bodies. In addition, Aristotle had many views on the elements. He believed that everything was derived of the elements earth, water, air, fire, and lastly the Aether. The Aether was a celestial element, and therefore made up the matter of the celestial bodies. The elements of earth, water, air and fire were derived of a combination of two of the characteristics of hot, wet, cold, and dry, and all had their inevitable place and motion. The motion of these elements begins with earth being the closest to "the Earth," then water, air, fire, and finally Aether. In addition to the makeup of all things, Aristotle came up with theories as to why things did not return to their natural motion. He understood that water sits above earth, air above water, and fire above air in their natural state. He explained that although all elements must return to their natural state, the human body and other living things have a constraint on the elements – thus not allowing the elements making one who they are to return to their natural state.
+The important legacy of this period included substantial advances in factual knowledge, especially in anatomy, zoology, botany, mineralogy, geography, mathematics and astronomy; an awareness of the importance of certain scientific problems, especially those related to the problem of change and its causes; and a recognition of the methodological importance of applying mathematics to natural phenomena and of undertaking empirical research. In the Hellenistic age scholars frequently employed the principles developed in earlier Greek thought: the application of mathematics and deliberate empirical research, in their scientific investigations. Neither reason nor inquiry began with the Ancient Greeks, but the Socratic method did, along with the idea of Forms, give great advances in geometry, logic, and the natural sciences. According to Benjamin Farrington, former professor of Classics at Swansea University:
+
+"Men were weighing for thousands of years before Archimedes worked out the laws of equilibrium; they must have had practical and intuitional knowledge of the principals involved. What Archimedes did was to sort out the theoretical implications of this practical knowledge and present the resulting body of knowledge as a logically coherent system."
+and again:
+
+"With astonishment we find ourselves on the threshold of modern science. Nor should it be supposed that by some trick of translation the extracts have been given an air of modernity. Far from it. The vocabulary of these writings and their style are the source from which our own vocabulary and style have been derived."
+
+=== Greek astronomy ===
+
+The astronomer Aristarchus of Samos was the first known person to propose a heliocentric model of the Solar System, while the geographer Eratosthenes accurately calculated the circumference of the Earth. Hipparchus (c. 190 – c. 120 BCE) produced the first systematic star catalog. The level of achievement in Hellenistic astronomy and engineering is impressively shown by the Antikythera mechanism (150–100 BCE), an analog computer for calculating the position of planets. Technological artifacts of similar complexity did not reappear until the 14th century, when mechanical astronomical clocks appeared in Europe.

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+---
+title: "History of science"
+chunk: 8/19
+source: "https://en.wikipedia.org/wiki/History_of_science"
+category: "reference"
+tags: "science, encyclopedia"
+date_saved: "2026-05-05T03:10:13.353605+00:00"
+instance: "kb-cron"
+---
+
+=== Hellenistic medicine ===
+There was not a defined societal structure for healthcare during the age of Hippocrates. At that time, society was not organized and knowledgeable as people still relied on pure religious reasoning to explain illnesses. Hippocrates introduced the first healthcare system based on science and clinical protocols. Hippocrates' theories about physics and medicine helped pave the way in creating an organized medical structure for society. In medicine, Hippocrates (c. 460–370 BCE) and his followers were the first to describe many diseases and medical conditions and developed the Hippocratic Oath for physicians, still relevant and in use today. Hippocrates' ideas are expressed in The Hippocratic Corpus. The collection notes descriptions of medical philosophies and how disease and lifestyle choices reflect on the physical body. Hippocrates influenced a Westernized, professional relationship among physician and patient. Hippocrates is also known as "the Father of Medicine". Herophilos (335–280 BCE) was the first to base his conclusions on dissection of the human body and to describe the nervous system. Galen (129 – c. 200 CE) performed many audacious operations—including brain and eye surgeries— that were not tried again for almost two millennia.
+
+=== Greek mathematics ===
+
+In Hellenistic Egypt, the mathematician Euclid laid down the foundations of mathematical rigor and introduced the concepts of definition, axiom, theorem and proof still in use today in his Elements, considered the most influential textbook ever written. Archimedes, considered one of the greatest mathematicians of all time, is credited with using the method of exhaustion to calculate the area under the arc of a parabola with the summation of an infinite series, and gave a remarkably accurate approximation of pi. He is also known in physics for laying the foundations of hydrostatics, statics, and the explanation of the principle of the lever.
+
+=== Other developments ===
+Theophrastus wrote some of the earliest descriptions of plants and animals, establishing the first taxonomy and looking at minerals in terms of their properties, such as hardness. Pliny the Elder produced one of the largest encyclopedias of the natural world in 77 CE, and was a successor to Theophrastus. For example, he accurately describes the octahedral shape of the diamond and noted that diamond dust is used by engravers to cut and polish other gems owing to its great hardness. His recognition of the importance of crystal shape is a precursor to modern crystallography, while notes on other minerals presages mineralogy. He recognizes other minerals have characteristic crystal shapes, but in one example, confuses the crystal habit with the work of lapidaries. Pliny was the first to show amber was a resin from pine trees, because of trapped insects within them.
+The development of archaeology has its roots in history and with those who were interested in the past, such as kings and queens who wanted to show past glories of their respective nations. The 5th-century-BCE Greek historian Herodotus was the first scholar to systematically study the past and perhaps the first to examine artifacts.

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+---
+title: "History of science"
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+source: "https://en.wikipedia.org/wiki/History_of_science"
+category: "reference"
+tags: "science, encyclopedia"
+date_saved: "2026-05-05T03:10:13.353605+00:00"
+instance: "kb-cron"
+---
+
+=== Greek scholarship under Roman rule ===
+During the rule of Rome, famous historians such as Polybius, Livy and Plutarch documented the rise of the Roman Republic, and the organization and histories of other nations, while statesmen like Julius Caesar, Cicero, and others provided examples of the politics of the republic and Rome's empire and wars. The study of politics during this age was oriented toward understanding history, understanding methods of governing, and describing the operation of governments.
+The Roman conquest of Greece did not diminish learning and culture in the Greek provinces. On the contrary, the appreciation of Greek achievements in literature, philosophy, politics, and the arts by Rome's upper class coincided with the increased prosperity of the Roman Empire. Greek settlements had existed in Italy for centuries and the ability to read and speak Greek was not uncommon in Italian cities such as Rome. Moreover, the settlement of Greek scholars in Rome, whether voluntarily or as slaves, gave Romans access to teachers of Greek literature and philosophy. Conversely, young Roman scholars also studied abroad in Greece and upon their return to Rome, were able to convey Greek achievements to their Latin leadership. And despite the translation of a few Greek texts into Latin, Roman scholars who aspired to the highest level did so using the Greek language. The Roman statesman and philosopher Cicero (106 – 43 BCE) was a prime example. He had studied under Greek teachers in Rome and then in Athens and Rhodes. He mastered considerable portions of Greek philosophy, wrote Latin treatises on several topics, and even wrote Greek commentaries of Plato's Timaeus as well as a Latin translation of it, which has not survived.
+In the beginning, support for scholarship in Greek knowledge was almost entirely funded by the Roman upper class. There were all sorts of arrangements, ranging from a talented scholar being attached to a wealthy household to owning educated Greek-speaking slaves. In exchange, scholars who succeeded at the highest level had an obligation to provide advice or intellectual companionship to their Roman benefactors, or to even take care of their libraries. The less fortunate or accomplished ones would teach their children or perform menial tasks. The level of detail and sophistication of Greek knowledge was adjusted to suit the interests of their Roman patrons. That meant popularizing Greek knowledge by presenting information that were of practical value such as medicine or logic (for courts and politics) but excluding subtle details of Greek metaphysics and epistemology. Beyond the basics, the Romans did not value natural philosophy and considered it an amusement for leisure time.
+Commentaries and encyclopedias were the means by which Greek knowledge was popularized for Roman audiences. The Greek scholar Posidonius (c. 135-c. 51 BCE), a native of Syria, wrote prolifically on history, geography, moral philosophy, and natural philosophy. He greatly influenced Latin writers such as Marcus Terentius Varro (116-27 BCE), who wrote the encyclopedia Nine Books of Disciplines, which covered nine arts: grammar, rhetoric, logic, arithmetic, geometry, astronomy, musical theory, medicine, and architecture. The Disciplines became a model for subsequent Roman encyclopedias and Varro's nine liberal arts were considered suitable education for a Roman gentleman. The first seven of Varro's nine arts would later define the seven liberal arts of medieval schools. The pinnacle of the popularization movement was the Roman scholar Pliny the Elder (23/24–79 CE), a native of northern Italy, who wrote several books on the history of Rome and grammar. His most famous work was his voluminous Natural History.
+After the death of the Roman Emperor Marcus Aurelius in 180 CE, the favorable conditions for scholarship and learning in the Roman Empire were upended by political unrest, civil war, urban decay, and looming economic crisis. In around 250 CE, barbarians began attacking and invading the Roman frontiers. These combined events led to a general decline in political and economic conditions. The living standards of the Roman upper class was severely impacted, and their loss of leisure diminished scholarly pursuits. Moreover, during the 3rd and 4th centuries CE, the Roman Empire was administratively divided into two halves: Greek East and Latin West. These administrative divisions weakened the intellectual contact between the two regions. Eventually, both halves went their separate ways, with the Greek East becoming the Byzantine Empire. Christianity was also steadily expanding during this time and soon became a major patron of education in the Latin West. Initially, the Christian church adopted some of the reasoning tools of Greek philosophy in the 2nd and 3rd centuries CE to defend its faith against sophisticated opponents. Nevertheless, Greek philosophy received a mixed reception from leaders and adherents of the Christian faith. Some such as Tertullian (c. 155-c. 230 CE) were vehemently opposed to philosophy, denouncing it as heretic. Others such as Augustine of Hippo (354-430 CE) were ambivalent and defended Greek philosophy and science as the best ways to understand the natural world and therefore treated it as a handmaiden (or servant) of religion. Education in the West began its gradual decline, along with the rest of Western Roman Empire, due to invasions by Germanic tribes, civil unrest, and economic collapse. Contact with the classical tradition was lost in specific regions such as Roman Britain and northern Gaul but continued to exist in Rome, northern Italy, southern Gaul, Spain, and North Africa.
+
+== Middle Ages ==
+In the Middle Ages, the classical learning continued in three major linguistic cultures and civilizations: Greek (the Byzantine Empire), Arabic (the Islamic world), and Latin (Western Europe).
+
+=== Byzantine Empire ===

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+title: "History of science"
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+category: "reference"
+tags: "science, encyclopedia"
+date_saved: "2026-05-05T03:10:13.353605+00:00"
+instance: "kb-cron"
+---
+
+==== Preservation of Greek heritage ====
+The fall of the Western Roman Empire led to a deterioration of the classical tradition in the western part (or Latin West) of Europe during the 5th century. In contrast, the Byzantine Empire resisted the barbarian attacks and preserved and improved the learning.
+While the Byzantine Empire still held learning centers such as Constantinople, Alexandria and Antioch, Western Europe's knowledge was concentrated in monasteries until the development of medieval universities in the 12th centuries. The curriculum of monastic schools included the study of the few available ancient texts and of new works on practical subjects like medicine and timekeeping.
+In the sixth century in the Byzantine Empire, Isidore of Miletus compiled Archimedes' mathematical works in the Archimedes Palimpsest, where all Archimedes' mathematical contributions were collected and studied.
+John Philoponus, another Byzantine scholar, was the first to question Aristotle's teaching of physics, introducing the theory of impetus. The theory of impetus was an auxiliary or secondary theory of Aristotelian dynamics, put forth initially to explain projectile motion against gravity. It is the intellectual precursor to the concepts of inertia, momentum and acceleration in classical mechanics. The works of John Philoponus inspired Galileo Galilei ten centuries later.
+
+==== Collapse ====
+During the Fall of Constantinople in 1453, a number of Greek scholars fled to North Italy in which they fueled the era later commonly known as the "Renaissance" as they brought with them a great deal of classical learning including an understanding of botany, medicine, and zoology. Byzantium also gave the West important inputs: John Philoponus' criticism of Aristotelian physics, and the works of Dioscorides.
+
+=== Islamic world ===
+
+This was the period (8th–14th century CE) of the Islamic Golden Age where commerce thrived, and new ideas and technologies emerged such as the importation of papermaking from China, which made the copying of manuscripts inexpensive.
+
+==== Translations and Hellenization ====
+The eastward transmission of Greek heritage to Western Asia was a slow and gradual process that spanned over a thousand years, beginning with the Asian conquests of Alexander the Great in 335 BCE to the founding of Islam in the 7th century CE. The birth and expansion of Islam during the 7th century was quickly followed by its Hellenization. Knowledge of Greek conceptions of the world was preserved and absorbed into Islamic theology, law, culture, and commerce, which were aided by the translations of traditional Greek texts and some Syriac intermediary sources into Arabic during the 8th–9th century.
+
+==== Education and scholarly pursuits ====
+
+Madrasas were centers for many different religious and scientific studies and were the culmination of different institutions such as mosques based around religious studies, housing for out-of-town visitors, and finally educational institutions focused on the natural sciences. Unlike Western universities, students at a madrasa would learn from one specific teacher, who would issue a certificate at the completion of their studies called an Ijazah. An Ijazah differs from a western university degree in many ways one being that it is issued by a single person rather than an institution, and another being that it is not an individual degree declaring adequate knowledge over broad subjects, but rather a license to teach and pass on a very specific set of texts. Women were also allowed to attend madrasas, as both students and teachers, something not seen in high western education until the 1800s. Madrasas were more than just academic centers. The Suleymaniye Mosque, for example, was one of the earliest and most well-known madrasas, which was built by Suleiman the Magnificent in the 16th century. The Suleymaniye Mosque was home to a hospital and medical college, a kitchen, and children's school, as well as serving as a temporary home for travelers.
+Higher education at a madrasa (or college) was focused on Islamic law and religious science and students had to engage in self-study for everything else. And despite the occasional theological backlash, many Islamic scholars of science were able to conduct their work in relatively tolerant urban centers (e.g., Baghdad and Cairo) and were protected by powerful patrons. They could also travel freely and exchange ideas as there were no political barriers within the unified Islamic state. Islamic science during this time was primarily focused on the correction, extension, articulation, and application of Greek ideas to new problems.

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+---
+title: "History of science and technology"
+chunk: 1/3
+source: "https://en.wikipedia.org/wiki/History_of_science_and_technology"
+category: "reference"
+tags: "science, encyclopedia"
+date_saved: "2026-05-05T03:10:15.701574+00:00"
+instance: "kb-cron"
+---
+
+The history of science and technology (HST) is a field of history that examines the development of the understanding of the natural world (science) and humans' ability to manipulate it (technology) at different points in time. This academic discipline also examines the cultural, economic, and political context and impacts of scientific practices; it likewise may study the consequences of new technologies on existing scientific fields.
+
+== Academic study of history of science ==
+
+History of science is an academic discipline with an international community of specialists. Main professional organizations for this field include the History of Science Society, the British Society for the History of Science, and the European Society for the History of Science.
+Much of the study of the history of science has been devoted to answering questions about what science is, how it functions, and whether it exhibits large-scale patterns and trends.
+
+=== History of the academic study of history of science ===
+Histories of science were originally written by practicing and retired scientists, starting primarily with William Whewell's History of the Inductive Sciences (1837), as a way to communicate the virtues of science to the public.
+Auguste Comte proposed that there should be a specific discipline to deal with the history of science.
+The development of the distinct academic discipline of the history of science and technology did not occur until the early 20th century. Historians have suggested that this was bound to the changing role of science during the same time period.
+After World War I, extensive resources were put into teaching and researching the discipline, with the hopes that it would help the public better understand both Science and Technology as they came to play an exceedingly prominent role in the world.
+In the decades since the end of World War II, history of science became an academic discipline, with graduate schools, research institutes, public and private patronage, peer-reviewed journals, and professional societies.
+
+==== Formation of academic departments ====
+In the United States, a more formal study of the history of science as an independent discipline was initiated by George Sarton's publications, Introduction to the History of Science (1927) and the journal Isis (founded in 1912). Sarton exemplified the early 20th-century view of the history of science as the history of great men and great ideas. He shared with many of his contemporaries a Whiggish belief in history as a record of the advances and delays in the march of progress.
+The study of the history of science continued to be a small effort until the rise of Big Science after World War II. With the work of I. Bernard Cohen at Harvard University, the history of science began to become an established subdiscipline of history in the United States.
+In the United States, the influential bureaucrat Vannevar Bush, and the president of Harvard, James Conant, both encouraged the study of the history of science as a way of improving general knowledge about how science worked, and why it was essential to maintain a large scientific workforce.
+
+== Universities with history of science and technology programs ==
+
+=== Argentina ===
+Buenos Aires Institute of Technology, Argentina, has been offering courses on History of the Technology and the Science.
+National Technological University, Argentina, has a complete history program on its offered careers.
+
+=== Australia ===
+The University of Sydney offers both undergraduate and postgraduate programmes in the History and Philosophy of Science, run by the Unit for the History and Philosophy of Science, within the Science Faculty. Undergraduate coursework can be completed as part of either a Bachelor of Science or a Bachelor of Arts Degree.  Undergraduate study can be furthered by completing an additional Honours year. For postgraduate study, the Unit offers both coursework and research-based degrees. The two course-work based postgraduate degrees are the Graduate Certificate in Science (HPS) and the Graduate Diploma in Science (HPS). The two research based postgraduate degrees are a Master of Science (MSc) and Doctor of Philosophy (PhD).
+
+=== Belgium ===
+University of Liège, has a Department called Centre d'histoire des Sciences et Techniques.
+
+=== Canada ===
+Carleton University Ottawa offer courses in Ancient Science and Technology in its Technology, Society and Environment program.
+University of Toronto has a program in History and Philosophy of Science and Technology.
+Huron University College offers a course in the History of Science which follows the development and philosophy of science from 10,000 BCE to the modern day.
+University of King's College in Halifax, Nova Scotia has a History of Science and Technology Program.
+
+=== France ===
+Nantes University has a dedicated Department called Centre François Viète.
+Paris Diderot University (Paris 7) has a Department of History and Philosophy of Science.
+A CNRS research center in History and Philosophy of Science SPHERE, affiliated with Paris Diderot University, has a dedicated history of technology section.
+Pantheon-Sorbonne University (Paris 1)  has a dedicated Institute of History and Philosophy of Science and Technics.
+The École Normale Supérieure de Paris has a history of science department.
+
+=== Germany ===
+
+Technische Universität Berlin, has a program in the History of Science and Technology.
+The Deutsches Museum, 'German Museum' of Masterpieces of Science and Technology in Munich is one of the largest science and technology museums in the world in terms of exhibition space, with about 28,000 exhibited objects from 50 fields of science and technology.
+
+=== Greece ===
+The University of Athens has a Department of Philosophy and History of Science

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+---
+title: "History of science and technology"
+chunk: 2/3
+source: "https://en.wikipedia.org/wiki/History_of_science_and_technology"
+category: "reference"
+tags: "science, encyclopedia"
+date_saved: "2026-05-05T03:10:15.701574+00:00"
+instance: "kb-cron"
+---
+
+=== India ===
+History of science and technology is a well-developed field in India. At least three generations of scholars can be identified.
+The first generation includes D.D.Kosambi, Dharmpal, Debiprasad Chattopadhyay and Rahman. The second generation mainly consists of Ashis Nandy, Deepak Kumar, Dhruv Raina, S. Irfan Habib, Shiv Visvanathan, Gyan Prakash, Stan Lourdswamy, V.V. Krishna, Itty Abraham, Richard Grove, Kavita Philip, Mira Nanda and Rob Anderson. There is an emergent third generation that includes scholars like Abha Sur and Jahnavi Phalkey.
+Departments and Programmes
+The National Institute of Science, Technology and Development Studies had a research group active in the 1990s which consolidated social history of science as a field of research in India. 
+Currently there are several institutes and university departments offering HST programmes.
+
+Jawaharlal Nehru University has an Mphil-PhD program that offers specialisation in Social History of Science. It is at the History of Science and Education group of the Zakir Husain Centre for Educational Studies (ZHCES) in the School of Social Sciences. Renowned Indian science historians Deepak Kumar and Dhruv Raina teach here. Also, *Centre for Studies in Science Policy has an Mphil-PhD program that offers specialization in Science, Technology, and Society along with various allied subdisciplines.
+Central University of Gujarat has an MPhil-PhD programme in Studies in Science, Technology & Innovation Policy at the Centre for Studies in Science, Technology & Innovation Policy (CSSTIP), where Social History of Science and Technology in India is a major emphasis for research and teaching.
+Banaras Hindu University has programs: one in History of Science and Technology at the Faculty of Science and one in Historical and Comparative Studies of the Sciences and the Humanities at the Faculty of Humanities.
+Andhra University has now set History of Science and Technology as a compulsory subject for all the First year B-Tech students.
+
+=== Israel ===
+Tel Aviv University. The Cohn Institute for the History and Philosophy of Science and Ideas is a research and graduate teaching institute within the framework of the School of History of Tel Aviv University.
+Bar-Ilan University has a graduate program in Science, Technology, and Society.
+
+=== Japan ===
+Kyoto University has a program in the Philosophy and History of Science.
+Tokyo Institute of Technology has a program in the History, Philosophy, and Social Studies of Science and Technology.
+The University of Tokyo has a program in the History and Philosophy of Science.
+
+=== Netherlands ===
+Utrecht University, has two co-operating programs: one in History and Philosophy of Science at the Faculty of Natural Sciences and one in Historical and Comparative Studies of the Sciences and the Humanities at the Faculty of Humanities.
+
+=== Poland ===
+Institute for the History of Science of the Polish Academy of Sciences offers PhD programmes and habilitation degrees in the fields of History of Science, Technology and Ideas.
+
+=== Russia ===
+
+=== Spain ===
+University of the Basque Country, offers a master's degree and PhD programme in History and Philosophy of Science and runs since 1952 THEORIA. International Journal for Theory, History and Foundations of Science. The university also sponsors the Basque Museum of the History of Medicine and Science, the only open museum of History of Science of Spain, that in the past offered also PhD courses.
+Universitat Autònoma de Barcelona, offers a master's degree and PhD programme in HST together with the Universitat de Barcelona.
+Universitat de València, offers a master's degree and PhD programme in HST together with the Consejo Superior de Investigaciones Científicas.
+
+=== Sweden ===
+Linköpings universitet, has a Science, Technology, and Society program which includes HST.
+
+=== Switzerland ===
+University of Bern, has an undergraduate and a graduate program in the History and Philosophy of Science.
+Ukraine
+
+State University of Infrastructure and Technologies, has a Department of Philosophy and History of Science and technology.
+
+=== United Kingdom ===
+University of Bristol has a masters and PhD program in the Philosophy and History of Science.
+University of Cambridge has an undergraduate course and a large masters and PhD program in the History and Philosophy of Science (including the History of Medicine).
+University of Durham has several undergraduate History of Science modules in the Philosophy department, as well as Masters and PhD programs in the discipline.
+University of Kent has a Centre for the History of the Sciences, which offers Masters programmes and undergraduate modules.
+University College London's Department of Science and Technology Studies offers undergraduate programme in History and Philosophy of Science, including two BSc single honour degrees (UCAS V550 and UCAS L391), plus both major and minor streams in history, philosophy and social studies of science in UCL's Natural Sciences programme. The department also offers MSc degrees in History and Philosophy of Science and in the study of contemporary Science, Technology, and Society. An MPhil/PhD research degree is offered, too. UCL also contains a Centre for the History of Medicine. This operates a small teaching programme in History of Medicine.
+University of Leeds has both undergraduate and graduate programmes in History and Philosophy of Science in the Department of Philosophy.
+University of Manchester offers undergraduate modules and postgraduate study in History of Science, Technology and Medicine and is sponsored by the Wellcome Trust.
+University of Oxford has a one-year graduate course in 'History of Science: Instruments, Museums, Science, Technology' associated with the Museum of the History of Science.
+The London Centre for the History of Science, Medicine, and Technology – this Centre closed in 2013. It was formed in 1987 and ran a taught MSc programme, jointly taught by University College London's Department of Science and Technology Studies and Imperial College London. The Masters programme transferred to UCL.

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+---
+title: "History of science and technology"
+chunk: 3/3
+source: "https://en.wikipedia.org/wiki/History_of_science_and_technology"
+category: "reference"
+tags: "science, encyclopedia"
+date_saved: "2026-05-05T03:10:15.701574+00:00"
+instance: "kb-cron"
+---
+
+=== United States ===
+Academic study of the history of science as an independent discipline was launched by George Sarton at Harvard with his book Introduction to the History of Science (1927) and the Isis journal (founded in 1912).  Sarton exemplified the early 20th century view of the history of science as the history of great men and great ideas. He shared with many of his contemporaries a Whiggish belief in history as a record of the advances and delays in the march of progress. 
+The History of Science was not a recognized subfield of American history in this period, and most of the work was carried out by interested scientists and physicians rather than professional historians.  With the work of I. Bernard Cohen at Harvard, the history of Science became an established subdiscipline of history after 1945.
+
+Arizona State University's Center for Biology and Society offers several paths for MS or PhD students who are interested in issues surrounding the history and philosophy of the science.
+California Institute of Technology offers courses in the History and Philosophy of Science to fulfill its core humanities requirements.
+Case Western Reserve University has an undergraduate interdisciplinary program in the History and Philosophy of Science and a graduate program in the History of Science, Technology, Environment, and Medicine (STEM).
+Cornell University offers a variety of courses within the Science and Technology course.
+Georgia Institute of Technology has an undergraduate and graduate program in the History of Technology and Society.
+Harvard University has an undergraduate and graduate program in History of Science
+Indiana University offers undergraduate courses and a masters and PhD program in the History and Philosophy of Science.
+Johns Hopkins University has an undergraduate and graduate program in the History of Science, Medicine, and Technology.
+Lehigh University offers an undergraduate level STS concentration (founded in 1972) and a graduate program with emphasis on the History of Industrial America.
+Massachusetts Institute of Technology has a Science, Technology, and Society program which includes HST.
+Michigan State University offers an undergraduate major and minor in History, Philosophy, and Sociology of Science through its Lyman Briggs College.
+New Jersey Institute of Technology has a Science, Technology, and Society program which includes the History of Science and Technology
+Oregon State University offers a Masters and Ph.D. in History of Science through its Department of History.
+Princeton University has a program in the History of Science.
+Rensselaer Polytechnic Institute has a Science and Technology Studies department
+Rutgers has a graduate Program in History of Science, Technology, Environment, and Health.
+Stanford has a History and Philosophy of Science and Technology program.
+Stevens Institute of Technology has an undergraduate and graduate program in the History of Science.
+University of California, Berkeley offers a graduate degree in HST through its History program, and maintains a separate sub-department for the field.
+University of California, Los Angeles has a relatively large group History of Science and Medicine faculty and graduate students within its History department, and also offers an undergraduate minor in the History of Science.
+University of California, Santa Barbara has an interdisciplinary graduate program emphasis in Technology & Society through the Center for Information Technology & Society.
+University of Chicago offers a B.A. program in the History, Philosophy, and Social Studies of Science and Medicine as well as M.A. and Ph.D. degrees through its Committee on the Conceptual and Historical Studies of Science.
+University of Florida has a Graduate Program in 'History of Science, Technology, and Medicine' at the University of Florida provides undergraduate and graduate degrees.
+University of Minnesota has a Ph.D. program in History of Science, Technology, and Medicine as well as undergraduate courses in these fields.
+University of Oklahoma has an undergraduate minor and a graduate degree program in History of Science.
+University of Pennsylvania has a program in History and Sociology of Science.
+University of Pittsburgh's Department of History and Philosophy of Science offers graduate and undergraduate courses.
+University of Puget Sound has a Science, Technology, and Society program, which includes the history of Science and Technology.
+University of Wisconsin–Madison has a program in History of Science, Medicine and Technology. It offers M.A. and Ph.D. degrees as well as an undergraduate major.
+Wesleyan University has a Science in Society program.
+Yale University has a program in the History of Science and Medicine.
+
+== Prominent historians of the field ==
+See also the list of George Sarton medalists.
+
+== Journals and periodicals ==
+Annals of Science
+The British Journal for the History of Science
+Centaurus
+Dynamis
+History and Technology (magazine)
+History of Science and Technology (journal)
+History of Technology (book series)
+Historical Studies in the Physical and Biological Sciences (HSPS)
+Historical Studies in the Natural Sciences (HSNS)
+HoST - Journal of History of Science and Technology
+ICON
+IEEE Annals of the History of Computing
+Isis
+Journal of the History of Biology
+Journal of the History of Medicine and Allied Sciences
+Notes and Records of the Royal Society
+Osiris
+Science & Technology Studies
+Science in Context
+Science, Technology, & Human Values
+Social History of Medicine
+Social Studies of Science
+Technology and Culture
+Transactions of the Newcomen Society
+Historia Mathematica
+Bulletin of the Scientific Instrument Society
+
+== See also ==
+History of science
+History of technology
+Ancient Egyptian technology
+History of science and technology in China
+History of science and technology in Japan
+History of science and technology in France
+History of science and technology in the Indian subcontinent
+Mesopotamian science
+Productivity improving technologies (historical)
+Science and technology in Argentina
+Science and technology in Canada
+Science and technology in Iran
+Science and technology in the United States
+Science in the medieval Islamic world
+Science tourism
+Technological and industrial history of the United States
+Timeline of science and engineering in the Islamic world
+
+== Professional societies ==
+The British Society for the History of Science (BSHS)
+History of Science Society (HSS)
+Newcomen Society
+Society for the History of Technology (SHOT)
+Society for the Social Studies of Science (4S)
+Scientific Instrument Society
+
+== References ==
+
+== Bibliography ==
+Historiography of science
+
+H. Floris Cohen, The Scientific Revolution: A Historiographical Inquiry, University of Chicago Press 1994 – Discussion on the origins of modern science has been going on for more than two hundred years. Cohen provides an excellent overview.
+Ernst Mayr, The Growth of Biological Thought, Belknap Press 1985
+Michel Serres,(ed.), A History of Scientific Thought, Blackwell Publishers 1995
+Companion to Science in the Twentieth Century, John Krige (Editor), Dominique Pestre (Editor), Taylor & Francis 2003, 941pp
+The Cambridge History of Science,  Cambridge University Press
+Volume 4, Eighteenth-Century Science, 2003
+Volume 5, The Modern Physical and Mathematical Sciences, 2002
+History of science as a discipline
+
+J. A. Bennett, 'Museums and the Establishment of the History of Science at Oxford and Cambridge', British Journal for the History of Science 30, 1997, 29–46
+Dietrich von Engelhardt, Historisches Bewußtsein in der Naturwissenschaft : von der Aufklärung bis zum Positivismus, Freiburg [u.a.] : Alber, 1979
+A.-K. Mayer, 'Setting up a Discipline: Conflicting Agendas of the Cambridge History of Science Committee, 1936–1950.' Studies in History and Philosophy of Science, 31, 2000

data/en.wikipedia.org/wiki/Yinzibing-0.md

@@ -0,0 +1,30 @@
+---
+title: "Yinzibing"
+chunk: 1/1
+source: "https://en.wikipedia.org/wiki/Yinzibing"
+category: "reference"
+tags: "science, encyclopedia"
+date_saved: "2026-05-05T03:10:11.552085+00:00"
+instance: "kb-cron"
+---
+
+Yinzibing (阴滋病) is an unverified disease. AIDS-like symptoms were reported by people who claimed that they had caught an infectious disease, but they tested negative for HIV.
+
+
+== Etymology ==
+The term was coined from "yīnxìng (negative)", "àizī (AIDS)", and "bìng (disease)". It was also referred to as "Yinxing Aizibing" (阴性艾滋病, HIV-negative AIDS).
+
+
+== History ==
+In 2011, rumors of an AIDS-like disease were spreading in Mainland China, which captured the attention of the media of China and Hong Kong and spread across the internet. The Disease Prevention and Control Bureau of China stated that no new virus was found and that yinzibing was a mental health problem.
+In 2013 an epidemiological study conducted by the Army Medical University in China found the following symptoms in patients claiming to have yinzibing: crepitus (crunching noise from the joints when moved), thick white tongue coating, muscle twitches (fasciculation), dry skin, burping, chronic sore throat and several others. The study found that 33% of yinzibing patients have low CD4 cells (less than 500 CD4 cells per mm3). The study concluded that this disease could not be completely explained by a mental disorder.
+A 2019 study suggested the symptoms were explainable as chronic fatigue syndrome, an illness usually precipitated by a viral infection.
+
+
+== References ==
+
+
+== External links ==
+Expert: AIDS-like disease is not just phobia China Daily, 2011.
+China's mystery HIV-like disease may be all in the mind BBC News, 2010.
+AIDS fear afflicts thousands across China People's Daily Online, 2009.