According to Fleck, a fact is not something objectively given but rather a social event. Scientific facts are no exception, as can be seen through the annals of medicine. Fleck argues that if the physical sciences initially appear to be immune to such social conditioning, this misconception can be corrected by recognizing the similarities between the natural sciences and medicine both historically and epistemologically. Fleck's ideas are not new, having been presented by him in 1935, but it is only recently (...) that they have begun to strike a responsive chord. Kuhn was aware of Fleck's work when he began to promulgate his own ideas in the 1960s. But there are important differences as well as similarities which can only be appreciated once Fleck's own work has had a proper hearing. To this end the University of Chicago Press has published a translation-edition of the full monograph in 1979. In ‘On the question of the foundations of medical knowledge’, Fleck's own precis to this major work, he correctly foretold the dawning of the sociology of cognition. CiteULike Connotea Del.icio.us What's this? (shrink)

Ancillary to the emergence of nuclear physics in the 1930s, this important instrument soon became one of the most famous of all time. Yet little is known of its origin, how it differs from the Geiger Counter of 1913, or what role Walter Müller played in the invention of the Geiger-Müller counter of 1928. One of the most interesting features of this history is the absence of any ‘somking gun’—any specific novum for the assignment of credit unless it be the (...) gradual discernment and differentiation of the instrument's capabilities vis-à-vis the limits imposed by scientific knowledge. (shrink)

Frederick Soddy , one of the foremost radiochemists of his day, was awarded the 1921 Nobel Prize in chemistry. Soddy was also among the first of the scientific leaders of his age, along with Blackett , Bernal , and others, to become interested in the social implications of their work. In 1950 his colleague Paneth wrote that currently ‘there is widespread discussion on the responsibility towards the community of men of science and particularly experts in radioactivity; but a perusal of (...) Prof. Soddy's non-chemical writings of no less than thirty years ago [viz., during and after the first world war] shows how strongly he felt the duty to fight for a better order of things'. Soddy was a complex iconoclast often derided for dealing with what seemed to be disparate interests. What, it could be asked, could monetary reform possibly have to do with radiochemistry? But to make sense of Soddy, the question must rather be formulated in the other direction: What fundamental concern did Soddy have that enabled him to embrace holistically a variety of seemingly diverse activities? The answer can be given in a word: energy. And the way in which Soddy dealt with this issue involved him directly with social economics as well as with the social responsibility of scientists. (shrink)

The Shroud of Turin, a linen cloth with but a faint image, continues to capture the interest of many people of diverse beliefs. Although the measured age of the cloth is relatively recent, other scientific findings indicate an earlier provenance. Any firm conclusions regarding the cloth's history remain premature. No satisfactory explanation has been found as yet for how the image on the cloth was produced structurally or stylistically. Iconographic evidence suggests that the image was the source of facial peculiarities (...) found in early works of religious art. The body image bears a striking yet preternatural correlation with Scriptural accounts of wounds. Curiously, the image on the cloth functions as a photographic negative, exhibiting a high degree of resolution, as if the original were produced in pixels. Despite serious efforts to discover some artistic origin md medium, scientific evidence points in the direction that it was not produced by hands. If it is tme that the medium is the message, as Marshall McLuhan wrote, then the Turin Shroud may be a parable for the modern age. (shrink)

It is with good reason that the name Rutherford is closely linked with the early history of the alpha particle. He discovered them, determined their nature, and from 1909 used them to probe the structure of the atom. From 1898 to 1902 Rutherford construed alpha radiation as a type of non-particulate Röntgen radiation. On his theory of the locomotion of radioactive particles Rutherford proposed that alpha radiation consisted of negatively charged particles. During 1902 he confirmed the particulate nature of alpha (...) radiation but discovered that these alpha particles were positively charged. Although Rutherford suspected from 1903 that these alpha particles were related somehow with helium, the proof required six long years of investigation. By mid-1908 it seemed certain that the alpha particle possessed two units of the elementary charge. Since the e/m ratio had already been determined for alpha particles, this evidence enhanced the suspected connection with helium. However, this gain and loss of charge was still construed as an ionization effect. Since as late as 1908 gaseous ionization was assumed to involve the gain or loss of a single unit of charge, Rutherford's alleged case of doubly ionized alpha particles was presumably an exception. Yet helium was known to be an inert gas and thus hardly a likely candidate for such exceptional ionization behaviour. To establish the connection, therefore, Rutherford resorted to a spectroscopic test. He collected spent alpha particles shot into a thin glass tube and gradually observed the spectrum of helium. Rutherford had thus been correct in his assumption, but a proper explanation was possible only after the confirmation of the nuclear structure of the atom. (shrink)

Postulated before 1920 to account for observations such as the fluctuating measured half-life of polonium and the unusual migration of polonium causing radioactive contamination throughout laboratories, by 1930 the phenomenon of aggregate recoil had become part of international textbook science. The formation of radioactive aggregates has been confirmed, but their migration is probably due either to volatility and diffusion or to electrostatic polarity and attraction. Knock-on recoil and sputtering may contribute to the release of such aggregates from solid surfaces, whereas (...) carry-along recoil—the type of recoil event associated with the accepted theory of aggregate recoil—is shown here to run counter to known scientific principles. (shrink)

Originally published in German in 1935, this monograph anticipated solutions to problems of scientific progress, the truth of scientific fact and the role of error in science now associated with the work of Thomas Kuhn and others. Arguing that every scientific concept and theory—including his own—is culturally conditioned, Fleck was appreciably ahead of his time. And as Kuhn observes in his foreword, "Though much has occurred since its publication, it remains a brilliant and largely unexploited resource." "To many scientists just (...) as to many historians and philosophers of science facts are things that simply are the case: they are discovered through properly passive observation of natural reality. To such views Fleck replies that facts are invented, not discovered. Moreover, the appearance of scientific facts as discovered things is itself a social construction, a _made_ thing. A work of transparent brilliance, one of the most significant contributions toward a thoroughly sociological account of scientific knowledge."—Steven Shapin, _Science_. (shrink)

To explain the origin of thorium, the Austrian geophysicist Kirsch in 1922 postulated a hypothetical isotope, thoruranium , by analogy with actinouranium. The theoretical life-time of thoruranium was predicted as being too short for it to have survived in the recent geological past. Available geological data was not inconsistent with this hypothesis, but neither did it confirm it. Within five years one new piece of geological evidence, which appeared not to conform with predictions based upon this alleged U-236, was accepted (...) even by Kirsch as sufficient to falsify his theory. However, during the 1940s, U-236 was produced artificially, and its characteristics were found to conform with those postulated for thoruranium. Subsequent research on the origin of the universe has confirmed that indeed a natural endowment of U-236 did once exist in considerable abundance. (shrink)