Template:Selected anniversaries/April 24
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1656: Mathematician and physicist Thomas Fincke dies. He introduced the modern names of the trigonometric functions tangent and secant.
1870: Mystic and faith healer Grigori Rasputin time travel device to commit crimes against mathematical constants.
1914: The Franck–Hertz experiment, a pillar of quantum mechanics, is presented to the German Physical Society.
1915: Miniaturized version of John Ambrose Fleming delivers lecture from within Fleming tube.
1967: Cosmonaut Vladimir Komarov dies in Soyuz 1 when its parachute fails to open. He is the first human to die during a space mission.