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TIL that Thomas Jefferson invented the swivel chair. He supposedly drafted the Declaration of Independence while sitting in his own creation, making it one of the first recorded uses of a swivel chair in history.

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via reddit.com

k6B7 TIL in certain public toilets (concert halls, bars) the light is sometimes blue to make veins harder to see. This way drug users can’t inject themselves
NX098 TIL: before the 2014 movie Interstellar, black holes were depicted in media as spinning whirlpools in space, but the movie used a team of physicists to determine how a black hole would look to the human eye
gr98 TIL Strippers make significantly more money while they’re ovulating.
7Jk7 TIL: Some cash machines in London have a Cockney language setting.
X0r98 TIL France helped America gain independence from Britain. During the American Revolution, Ben Franklin persuaded France to give troops, money, and supplies to support America. It was risky and expensive, but the French were convinced that unity with Americans would lead to Britain’s defeat in NA.