1921 in science
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|List of years in science (table)|
|... 1911 . 1912 . 1913 . 1914 . 1915 . 1916 . 1917 ...
1918 1919 1920 -1921- 1922 1923 1924
... 1925 . 1926 . 1927 . 1928 . 1929 . 1930 . 1931 ...
|Art . Archaeology . Architecture . Literature . Music . Philosophy . Science +...|
- Winkel tripel projection proposed.
- Étienne Biéler and James Chadwick publish a key paper on the strong interaction.
- Thomas Midgley discovers the effective anti-knocking properties of tetraethyllead, which is used in "leaded" gasoline (petrol).
- Danish explorer Lauge Koch first sets foot on and names Kaffeklubben Island, the northernmost point of land on Earth.
- John Maynard Keynes publishes A Treatise on Probability.
- Emmy Noether publishes Idealtheorie in Ringbereichen, developing ideal ring theory, an important text in the field of abstract algebra.
- First publication of Ludwig Wittgenstein's Tractatus Logico-Philosophicus, as "Logisch-Philosophische Abhandlung" in Annalen der Naturphilosophie.
- July 18 – The first BCG vaccination against tuberculosis.
- July 27 – Researchers at the University of Toronto led by biochemist Frederick Banting announce the discovery of the hormone insulin.
- American biochemist Elmer McCollum identifies the presence of a component in cod liver oil which cures rickets, which he calls vitamin D.
- Fidel Pagés pioneers epidural anesthesia.
- T. Kaluza demonstrates that a five-dimensional version of Albert Einstein's equations unifies gravitation and electromagnetism.
- Hermann Rorschach publishes Psychodiagnostik, proposing the inkblot test.
- Gaëtan Gatian de Clérambault publishes Les Psychoses passionelles, a comprehensive review of erotomania.
- October 25 – Hugo A. F. Abt is granted a patent for his design of bascule bridge.
- The vibraphone in its original form is invented in the United States.
- Journalist E. W. Scripps and biologist William Emerson Ritter found Science Service, later renamed Society for Science and the Public, in the United States with the goal of keeping the public informed of scientific developments.
- Nobel Prize
- March 11 – Léopold Reichling (died 2009), Luxembourg biologist and naturalist.
- April 21 – John R. Huizenga (died 2014), American nuclear physicist.
- April 30 – Ralph A. Lewin (died 2008), Anglo-American biologist, "the father of green algae genetics".
- May 18 – Olgierd Zienkiewicz (died 2009), British civil engineer.
- June 14 – George Rédei (died 2008), Hungarian biologist.
- July 4 – Aron Arthur Moscona (died 2009), American developmental biologist.
- October 5 – Mahlon Hoagland (died 2009), American biochemist, discoverer of transfer RNA (tRNA).
- October 21 – Victor A. McKusick (died 2008), American "father of genetic medicine".
- March 29 – John Burroughs (born 1837), naturalist.
- October 23 – John Boyd Dunlop (born 1840), inventor.
- "The Collisions of Particles with Hydrogen Nuclei" (PDF). Philosophical Magazine 42 (252): 923–940. 1921.
- Crilly, Tony (2007). 50 Mathematical Ideas You Really Need to Know. London: Quercus. p. 57. ISBN 978-1-84724-008-8.
- Weyl, Hermann (1935). "Emmy Noether". Scripta Mathematica 3: 201–220.
- Carere, Suzanne (2007-07-25). "Age-old children's disease back in force". thestar.com. Toronto. Retrieved 2012-01-26.
- Conis, Elena (2006-07-24). "Fortified foods took out rickets". Los Angeles Times. Retrieved 2012-01-26.
- McClean, Franklin C.; Budy, Ann M. (1963). "Vitamin A, Vitamin D, Cartilage, Bones, and Teeth". In Harris, Robert S. Vitamins and Hormones 21. New York; London: Academic Press. pp. 51–52.
- United States Patent #1,394,519.