Summary Apart from hydrogen, helium is the most abundant chemical element in the universe, and yet it was only discovered on the Earth in 1895. Its early history is unique because it encompasses astronomy as well as chemistry, two sciences which the spectroscope brought into contact during the second half of the nineteenth century. In the modest form of a yellow spectral line known as D3, ‘helium’ was sometimes supposed to exist in the Sun's atmosphere, an idea which is traditionally (...) ascribed to J. Norman Lockyer. Did Lockyer discover helium as a solar element? How was the suggestion received by chemists, physicists and astronomers in the period until the spring of 1895, when William Ramsay serendipitously found the gas in uranium minerals? The hypothetical element helium was fairly well known, yet Ramsay's discovery owed little or nothing to Lockyer's solar element. Indeed, for a brief while it was thought that the two elements might be different. The complex story of how helium became established as both a solar and terrestrial element involves precise observations as well as airy speculations. It is a story that is unique among the discovery histories of the chemical elements. (shrink)

Should governments accept the principle of devoting a proportion of their resources to funding basic research? From the standpoint of economics, science should be considered as a public good and for that reason it should be protected from market forces. This article tries to show that this result can only be maintained at the price of abandoning arguments traditionally deployed by economists themselves. It entails a complete reversal of our habitual ways of thinking about public goods. In order to bring (...) this reversal about, this article draws on the central results obtained by the anthropology and sociology of science and technology over the past several years. Science is a public good, not because of its intrinsic properties but because it is a source of diversity and flexibility. (shrink)