Portal:History of science/Selected anniversaries/April 13

April 13:

 * 1802 - Birth of Leopold Fitzinger, Austrian zoologist (d. 1884)


 * 1850 - Birth of Arthur Matthew Weld Downing, British astronomer (d. 1917)


 * 1853 - Death of Leopold Gmelin, German chemist (b. 1788)


 * 1855 - Death of Henry De la Beche, English geologist (b. 1796)


 * 1880 - Death of Robert Fortune, Scottish botanist (b. 1813)


 * 1909 - Birth of Stanisław Marcin Ulam, Polish mathematician (d. 1984)


 * 1941 - Birth of Michael Stuart Brown, American geneticist, Nobel laureate


 * 1941  - Death of Annie Jump Cannon, American astronomer (b. 1863)


 * 1953 - CIA director Allen Dulles launches the mind-control program MKULTRA


 * 1974 - Western Union (in cooperation with NASA and Hughes Aircraft) launches the U.S.'s first commercial geosynchronous communications satellite, Westar 1


 * 1983 - Death of Theodore Stephanides, Greek doctor and naturalist (b. 1896)


 * 2008 - Death of John Wheeler, American physicist and educator (b. 1911)