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Science on the 21st of April in history

Science

Date	Type	Text
21 Apr 1503 Battle of Cerignola	science	Battle of Cerignola (technology) Battle of Cerignola: Spanish forces defeat the French, considered the first battle in history won by gunpowder small arms.	0
21 Apr 1552 Petrus Apianus	science	death Petrus Apianus Petrus Apianus, German cartographer and cosmographer (born 1495)	0
21 Apr 1652 Michel Rolle	science	birth Michel Rolle Michel Rolle, French mathematician, known for Rolle's theorem (died 1719)	0
21 Apr 1735 Ivan Petrovich Kulibin	science	birth Ivan Petrovich Kulibin Ivan Petrovich Kulibin, Russian inventor (died 1818)	0
21 Apr 1774 Jean-Baptiste Biot	science	birth Jean-Baptiste Biot Jean-Baptiste Biot (died 1862), physicist.	0
21 Apr 1793 John Michell	science	death John Michell John Michell, geologist (born 1724)	0
21 Apr 1832 Cyrille Pierre Théodore Laplace	science	Cyrille Pierre Théodore Laplace (exploration) Cyrille Pierre Théodore Laplace completes a four-year global circumnavigation.	0
21 Apr 1838 John Muir	science	birth John Muir John Muir (died 1914), naturalist.	0
21 Apr 1864 Max Weber	science	birth Max Weber Max Weber (died 1920), German sociologist.	0
21 Apr 1889 Paul Karrer	science	birth Paul Karrer Paul Karrer (died 1971), Swiss winner of Nobel Prize in Chemistry.	0
21 Apr 1921 John R. Huizenga	science	birth John R. Huizenga John R. Huizenga (died 2014), American nuclear physicist.	0
21 Apr 1934 Carsten Borchgrevink	science	death Carsten Borchgrevink Carsten Borchgrevink (born 1864), Norwegian Antarctic explorer.	0
21 Apr 1954 Emil Post	science	death Emil Post Emil Post (born February 11, 1897), American mathematician and logician	0
21 Apr 1976 Carl Benjamin Boyer	science	death Carl Benjamin Boyer Carl Benjamin Boyer (b. 1906), American historian of mathematics.	0
21 Apr 1978 Thomas Wyatt Turner	science	death Thomas Wyatt Turner Thomas Wyatt Turner (b. 1877), American civil rights activist, biologist and educator; first black person ever to receive a doctorate from Cornell.	0
21 Apr 1992 extrasolar planets	science	extrasolar planets (astronomy) First confirmed detection of extrasolar planets with announcement of the discovery of several terrestrial-mass planets orbiting the pulsar PSR B1257+12 by Aleksander Wolszczan and Dale Frail.	0

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