The year 1921 in science and technology involved some significant events, listed below.

Chemistry

• Thomas Midgley discovers the effective anti-knocking properties of Tetra-ethyl lead, which is used in "leaded" gasoline (petrol).

Mathematics

• 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.^[1][2]
• First publication of Ludwig Wittgenstein's Tractatus Logico-Philosophicus, as "Logisch-Philosophische Abhandlung" in Annalen der Naturphilosophie.

Medicine

• 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.^[3][4][5]
• Fidel Pag s pioneers epidural anesthesia

Physics

• T. Kaluza demonstrates that a five-dimensional version of Albert Einstein's equations unifies gravitation and electromagnetism.

Psychology

• Hermann Rorschach publishes Psychodiagnostik, proposing the inkblot test.
• Ga tan Gatian de Cl rambault publishes Les Psychoses passionelles, a comprehensive review of erotomania.

Technology

• October 25 - Hugo A. F. Abt is granted a patent for his design of bascule bridge.^[6]

Awards

• Nobel Prize
  • Physics - Albert Einstein
  • Chemistry - Frederick Soddy
  • Physiology or Medicine - not awarded

Births

• October 21 - Victor A. McKusick (died 2008), "The Father of Genetic Medicine".

Deaths

• March 29 - John Burroughs (born 1837), naturalist.
• October 23 - John Boyd Dunlop (born 1840), inventor.

References

fr:1921 en science he:1921 mk:1921 no:Vitenskaps ret 1921 nn:Vitskap i 1921 pl:1921 w nauce pt:1921 na ci ncia sv:Vetenskaps ret 1921