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The sociology of the history of science—related to sociology and philosophy of science, as well as the entire field of science studies—has in the 20th century been occupied with the question of large-scale patterns and trends in the development of science, and asking questions about how science "works" both in a philosophical and practical sense.
One of the basic requirements for a scientific community is the existence and approval of a political sponsor; in England, the Royal Society operates under the aegis of the monarchy; in the US, the National Academy of Sciences was founded by Act of the United States Congress; etc. Otherwise, when the basic elements of knowledge were being formulated, the political rulers of the respective communities could choose to arbitrarily either support or disallow the nascent scientific communities. For example, Alhazen had to feign madness to avoid execution. The polymath Shen Kuo lost political support, and could not continue his studies until he came up with discoveries that showed his worth to the political rulers. The admiral Zheng He could not continue his voyages of exploration after the emperors withdrew their support. Another famous example was the suppression of the work of Galileo, by the twentieth century, Galileo would be pardoned.
One of the major occupations with those interested in the history of science is whether or not it displays certain patterns or trends, usually along the question of change between one or more scientific theories. Generally speaking, there have historically been three major models adopted in various forms within the philosophy of science.
The first major model, implicit in most early histories of science and generally a model put forward by practicing scientists themselves in their textbook literature, is associated with the criticisms of logical positivism by Karl Popper (1902–1994) from the 1930s. Popper's model of science is one in which scientific progress is achieved through a falsification of incorrect theories and the adoption instead of theories which are progressively closer to truth. In this model, scientific progress is a linear accumulation of facts, each one adding to the last. In this model, the physics of Aristotle (384 BC – 322 BC) was simply subsumed by the work of Isaac Newton (1642–1727) (classical mechanics), which itself was eclipsed by the work of Albert Einstein (1879–1955) (Relativity), and later the theory of quantum mechanics (established in 1925), each one more accurate than the last.
A major challenge to this model came from the work of the historian and philosopher Thomas Kuhn (1922–1996) in his work The Structure of Scientific Revolutions published in 1962. Kuhn, a former physicist, argued against the view that scientific progress was linear, and that modern scientific theories were necessarily just more accurate versions of theories of the past. Rather, Kuhn's version of scientific development consisted of dominant structures of thought and practices, which he called "paradigms", in which research went through phases of "normal" science ("puzzle solving") and "revolutionary" science (testing out new theories based on new assumptions, brought on by uncertainty and crisis in existing theories). In Kuhn's model, different paradigms represented entirely different and incommensurate assumptions about the universe. The mode was thus uncertain about whether paradigms shifted in a way which necessarily relied upon greater attainment of truth. In Kuhn's view, Aristotle's physics, Newton's classical mechanics, and Einstein's Relativity were entirely different ways to think about the world; each successive paradigm defined what questions could be asked about the world and (perhaps arbitrarily) discarded aspects of the previous paradigm which no longer seemed applicable or important. Kuhn claimed that far from merely building on the previous theory's accomplishments, each new paradigm essentially throws out the old way of looking at the universe, and comes up with its own vocabulary to describe it and its own guidelines for expanding knowledge within the new paradigm.
Kuhn's model met with much suspicion from scientists, historians, and philosophers. Some scientists felt that Kuhn went too far in divorcing scientific progress from truth; many historians felt that his argument was too codified for something as polyvariant and historically contingent as scientific change; and many philosophers felt that the argument did not go far enough. The furthest extreme of such reasoning was put forth by the philosopher Paul Feyerabend (1924–1994), who argued that there were no consistent methodologies used by all scientists at all times which allowed certain forms of inquiry to be labeled "scientific" in a way which made them different from any other form of inquiry, such as witchcraft. Feyerabend argued harshly against the notion that falsification was ever truly followed in the history of science, and noted that scientists had long undertaken practices to arbitrarily consider theories to be accurate even if they failed many sets of tests. Feyerabend argued that a pluralistic methodology should be undertaken for the investigation of knowledge, and noted that many forms of knowledge which were previously thought to be "non-scientific" were later accepted as a valid part of the scientific canon.
Many other theories of scientific change have been proposed over the years with various changes of emphasis and implications. In general, though, most float somewhere between these three models for change in scientific theory, the connection between theory and truth, and the nature of scientific progress.
Individual ideas and accomplishments are among the most famous aspects of science, both internally and in larger society. Breakthrough figures like Sir Isaac Newton or Albert Einstein are often celebrated as geniuses and heroes of science. Popularizers of science, including the news media and scientific biographers, contribute to this phenomenon. But many scientific historians emphasize the collective aspects of scientific discovery, and de-emphasize the importance of the "Eureka!" moment.
A detailed look at the history of science often reveals that the minds of great thinkers were primed with the results of previous efforts, and often arrive on the scene to find a crisis of one kind or another. For example, Einstein did not consider the physics of motion and gravitation in isolation. His major accomplishments solved a problem which had come to a head in the field only in recent years — empirical data showing that the speed of light was inexplicably constant, no matter the apparent speed of the observer. (See Michelson–Morley experiment.) Without this information, it is very unlikely that Einstein would have conceived of anything like relativity.
The question of who should get credit for any given discovery is often a source of some controversy. There are many priority disputes, in which multiple individuals or teams have competing claims over who discovered something first. Multiple simultaneous discovery is actually a surprisingly common phenomenon, perhaps largely explained by the idea that previous contributions (including the emergence of contradictions between existing theories, or unexpected empirical results) make a certain concept ready for discovery. Simple priority disputes are often a matter of documenting when certain experiments were performed, or when certain ideas were first articulated to colleagues or recorded in a fixed medium.
Many times the question of exactly which event should qualify as the moment of discovery is difficult to answer. One of the most famous examples of this is the question of the discovery of oxygen. While Carl Wilhelm Scheele and Joseph Priestley were able to concentrate oxygen in the laboratory and characterize its properties, they did not recognize it as a component of air. Priestly actually thought it was missing a hypothetical component of air, known as phlogiston, which air was supposed to absorb from materials that are being burned. It was only several years later that Antoine Lavoisier first conceived of the modern notion of oxygen — as a substance that is consumed from the air in the processes of burning and respiration.
By the late 20th century, scientific research has become a large-scale effort, largely accomplished in institutional teams. The amount and frequency of inter-team collaboration has continued to increase, especially after the rise of the Internet, which is a central tool for the modern scientific community. This further complicates the notion of individual accomplishment in science.