1921 In Science

Chemistry

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

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.

Physics

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

Awards

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

Births

• May 21 - Andrei Sakharov (d. 1989), physicist, human rights activist, Nobel Laurette in Peace

Deaths

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

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