Also on This Day in History April 29
Discover what happened on April 29 with HISTORY's summaries of major events, anniversaries,
famous births and notable deaths.
Births on This Day, April 29
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1893
Harold C. Urey
American scientist awarded the Nobel Prize for Chemistry in 1934 for his discovery of deuterium, the heavy form of hydrogen (1932).
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1872
Forest Ray Moulton
American astronomer who collaborated with Thomas Chamberlin in advancing the planetesimal theory of the origin of the solar system (1904).
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1667
John Arbuthnot
French physician, mathematician and essayist who discovered Mersenne numbers, a pioneering effort to derive a formula that would represent all prime numbers.
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1854
Jules Henri Poincaré
French mathematician, physicist and astronomer who was also a gifted interpreter of science to the public.
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1894
Marietta Blau
Austrian nuclear physicist who began as a strong student in mathematics and physics at school, and studied physics at university, where she wrote her thesis on the absorption of gamma rays (1919).
Deaths on This Day, April 29
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2008
Albert Hofmann
Swiss pharmacologist who discovered LSD (-lysergic acid diethylamide). For his doctoral thesis he studied the chemical structure of chitin.
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1937
Wallace Hume Carothers
American chemist who developed nylon (1935), the first synthetic polymer fibre to be spun from a melt.
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1891
John LeConte
American physicist who promoted the use of statistics in medical research, and discovered the sensitive flame (1858).
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1768
Georg Brandt
Swedish chemist who was the first person to discover a metal unknown in ancient times, which he isolated and named cobalt (1730).
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1864
Charles-Julien Brianchon
French mathematician who published a geometrical theorem (named as Brianchon's theorem) while a student (1806).