Births
1769 - Jean Nicolas Pierre Hachette, French mathematician
1856 - Sigmund Freud, Austrian psychiatrist
1871 - Victor Grignard, Chemist and Nobel Prize laureate
1872 - Willem de Sitter, Dutch scientist
1916 - Robert H. Dicke, American physicist
1929 - Paul Lauterbur, Nobel laureate in Physiology or Medicine.
Deaths
1859 - Alexander von Humboldt, German naturalist and explorer
1951 - Ãlie Cartan, French mathematician
1963 - Theodore von Kármán, Hungarian-born physicist
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1896 - Rolf Maximilian Sievert, Swedish medical physicist
SI derived unit of ionized radiation dose equivalent named for him.