In a year already crowded with photographic firsts, Sir John Herschel quietly added another milestone on September 9, 1839: the first successful image fixed on glass. The achievement, overshadowed at the time by the announcements of Louis Daguerre in Paris and William Henry Fox…
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On August 25, 1609, the Italian astronomer and philosopher Galilei Galileo debuted something to Venetian merchants that would make him both a legend and a heretic–his telescope. The Guardian writes, “A refinement of models first devised in the Netherlands, Galileo’s slim, brown stick was puny…
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On August 18, 1868, one of the most abundant gases in the universe was discovered. Though less common on Earth, the discovery of helium marked a significant milestone in the history of chemistry and physics and has been credited to two scientists who made…
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