Template:Selected anniversaries/April 13
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1923: Mathematician Karl Menger uses Gnomon algorithm techniques to fight crimes against mathematical constants.
1953: CIA director Allen Dulles authorizes the mind-control program Project MKUltra.
1954: Latest generation of Carnivorous dirigibles develop artificial intelligence and escape into the upper atmosphere, later adapting themselves for space travel.
2008: Theoretical physicist John Archibald Wheeler dies. He linked the term "black hole" to objects with gravitational collapse, and coined the terms "quantum foam", "neutron moderator", "wormhole" and "it from bit".