Template:Selected anniversaries/September 9
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1737: Physician and physicist Luigi Galvani born. In 1780, he will discover that the muscles of dead frogs' legs twitch when struck by an electrical spark.
1917: Mathematician and philosopher Georg Cantor publishes new theory of sets derived from Gnomon algorithm functions. Colleagues hail it as "a magisterial contribution to science and art of detecting and preventing crimes against mathematical constants."
1947: First case of a computer bug being found: A moth lodges in a relay of a Harvard Mark II computer at Harvard University.
2017: The Custodian tells a funny story about why you can't go in there.