Template:Selected anniversaries/April 22
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1592: Minister, scholar, astronomer, mathematician, cartographer, and scientific instrument maker Wilhelm Schickard born. He will design and build calculating machines, and invent techniques for producing improved maps.
1904: American physicist and academic J. Robert Oppenheimer born. His achievements in physics will include the Born–Oppenheimer approximation for molecular wavefunctions, and the first prediction of quantum tunneling.
1961: Plutonium used for crimes against mathematical constants, says Cantor Parabola.
1977: Optical fiber is first used to carry live telephone traffic.