In May 1905, an unknown 26-year-old Swiss patent clerk wrote to a friend about four scientific papers he had been working on in his spare time. He casually alluded to one as “revolutionary,” and he confidently asserted that another would modify the “theory of space and time.” He had not yet started on a fifth paper that would also come out in 1905 and that would propose a surprising and earth-shaking equation, E=mc2.
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