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Births 1541 - Michele Mercati, Italian physician 1818 - August Wilhelm von Hofmann, German chemist 1865 - Charles W. Woodworth, American entomologist 1869 - Harvey Cushing, American neurosurgeon 1911 - Melvin Calvin, American chemist, Nobel Prize laureate for discovering the Calvin Cycle (see…

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Events 1923 - Insulin first became generally available for use by diabetics. Births 1452 - Leonardo da Vinci, Italian Renaissance polymath (above) 1552 - Pietro Cataldi, Italian mathematician 1641 - Robert Sibbald, Scottish physician 1707 - Leonhard Euler, Swiss mathematician 1710 - William…

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Events 1969 - Mariner 7 is launched. Births 1712 - Claude Bourgelat, French veterinary surgeon 1817 - Karl Wilhelm von NÃ¤geli, Swiss biologist 1845 - Wilhelm Conrad RÃ¶ntgen, German physicist, Nobel Prize laureate 1847 - Otto Wallach, German chemist, Nobel Prize laureate 1847 - Otto Wallach…

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Events 1970 - Explorer 1 re-enters the Earth's atmosphere (after 12 years in orbit). 1994 - Bill Kimbel, Don Johanson and Yoel Rak report the finding in Ethiopia of the first fairly complete Australopithecus afarensis skull (AL 444-2, see above) Births 1596 - RenÃ© Descartes, French…

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Google has a clever version of their logo posted for the holiday.

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