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TIL in the 1950s an American economist (Armen A. Alchian) figured out lithium was used to fuel Hydrogen bombs just by looking at publicly-available stock prices.

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4QR TIL That a Nanometer is about the distance a beard hair grows in the time it takes you to raise the razor to your face
jPrn TIL Theodore Roosevelt watched his mother die of typhoid fever and then immediately had to go upstairs and see his wife die of complications from childbirth.
xvVw TIL Every American gold or silver medalist in the 100m sprint since 1988 was eventually busted for doping
6E7D8 TIL that one of the documents the US Constitution is predominantly modeled after is the Iroquois Constitution, an extremely sophisticated and logically consistent document that governed the 5 Native American tribes of the Iroquois Confederacy: the Mohawk, Oneida, Onondaga, Cayuga and Seneca people.
KQ76 TIL that Japan was almost completely isolated from the outside world for over 200 years between the 17th and 19th centuries due to a policy called “Sakoku”. No foreigner could enter and no Japanese could leave the country under penalty of death.