Template:Selected anniversaries/April 13

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1923: Mathematician Karl Menger uses Gnomon algorithm techniques to fight crimes against mathematical constants.
2014: Egg Tooth Neighborhood Association renews support for New Minneapolis charter.

https://en.wikipedia.org/wiki/John_Archibald_Wheeler

https://en.wikipedia.org/wiki/Robert_Watson-Watt

1953 – CIA director Allen Dulles launches the mind-control program Project MKUltra.

1960 – The United States launches Transit 1-B, the world's first satellite navigation system.

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