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TIL: The cleaning solution, 409, is called '409' because it took 409 tries to get the formula right

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via reddit.com

9YQkp TIL the Manhattan Project scientists originally wanted to bomb Kyoto, but Secretary of War Henry Stimson successfully convinced the president that it would be needless culture vandalism, as he had toured the city on his honeymoon and knew it was not a military target.
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