Also on This Day in History February 21
Discover what happened on February 21 with HISTORY's summaries of major events, anniversaries,
famous births and notable deaths.
Births on This Day, February 21
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1791
John Mercer
English chemist and industrialist who invented the mercerisation process for treating cotton which is still in use today and was a pioneer in colour photography.
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1866
August von Wassermann
German bacteriologist whose discovery of a universal blood-serum test (1906) for syphilis helped extend the basic tenets of immunology to diagnosis.
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1895
Carl Peter Henrik Dam
Danish biochemist who shared (with Edward A. Doisy) the 1943 Nobel Prize in Physiology or Medicine for research into antihemorrhagic substances and the discovery of vitamin K (1939).
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1892
Harry Stack Sullivan
American psychiatrist who developed a theory of psychiatry based on interpersonal relationships.
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1849
Édouard Gaston Deville
French-born Canadian surveyor of Canadian lands (1875-1924) who perfected the first practical method of photogrammetry, or the making of maps based on photography.
Deaths on This Day, February 21
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1993
Inge Lehmann
Danish seismologist and geophysicist who was the first person in that field in her home country, and the first true female geophysicist in the world.
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1926
Heike Kamerlingh Onnes
Dutch physicist who was awarded the 1913 Nobel Prize for Physics for his work on low-temperature physics in which he liquified hydrogen and helium.
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1938
George Ellery Hale
American astronomer known for his development of important astronomical instruments
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1938
Nathan Pritikin
American scientist, inventor and nutritionist. Pritikin believed that moderate exercise combined with a diet low in fat and high in unrefined carbohydrates reversed his own heart disease discovered in the late 1950's.
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1912
Osborne Reynolds
British engineer, physicist, and educator best known for his work in hydraulics and hydrodynamics.