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TIL that Martha Washington's portrait on the 1896 US one-dollar bill is the most recent time that a woman has been featured on US paper money

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v7d8 TIL that a gene mutation allows a very small number of people to naturally sleep four hours per night, with no effects on mental or physical health. This would be evolution.
r8wx TIL that an American POW in Vietnam blinked the morse code for TORTURE during a propaganda interview.
7rKQL TIL in WW2 the Nazis were thinking of ruining the British economy by dropping counterfeit bank notes, causing inflation.
N9wJ TIL the same guy invented Pizza Hut’s Stuffed Crust Pizza, McDonald’s McGriddles and Dollar Menu, and the Smashburger restaurant chain
P1W6w TIL Nitrogen bubbles in the synovial fluid get trapped then released from moving joints and stretches, causing painless noises. Crepitus is harmless when not caused by an injury, medical condition or disease