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.
1890: Time travel device develops self-awareness, visits John Ambrose Fleming.
1891: Miniaturized version of John Ambrose Fleming delivers lecture from within Fleming tube.