1940 in science
See also:
Other events of 1940
List of years in science
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1939 in science
1940 in science
1941 in science
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The year 1940 in science and technology consisted of many events, including those below.
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Biology
- February 2 - The first transposons are discovered in maize (Zea mays, aka corn) by Barbara McClintock.
Computer science
- February 2 - The Complex Number Calculator, a calculator for complex arithmetic based on relays, was completed. (see History of computing hardware).
Chemistry
- February 27 - The radioactive isotope carbon-14 is discovered by Martin Karmen and Ram Ruben
- Astatine synthesized by Corson, MacKenzie, and Segre
- Neptunium, the first transuranic element, synthesized by McMillan and Abelson
Physics
- January 5 - FM radio demonstrated to the FCC for the first time
- Magnetron invented by John Randall and Harry Boot