Template:Selected anniversaries/April 22
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1904: American physicist and academic J. Robert Oppenheimer born. His achievements in physics will include the Born–Oppenheimer approximation for molecular wavefunctions, work on the theory of electrons and positrons, the Oppenheimer–Phillips process in nuclear fusion, and the first prediction of quantum tunneling.
1961: Plutonium used for crimes against mathematical constants, says Cantor Parabola.
1964: Publication of The Hal Jordan Playbook reveals new class of crimes against mathematical constants.
1977: Optical fiber is first used to carry live telephone traffic.