See also: 1939 in science, other events of 1940, 1941 in science and the list of years in science.
Aeronautics First flight of the P-51 Mustang 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 Births November 26 - Enrico Bombieri, mathematician Deaths