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TIL that the old euphemism for a positive pregnancy test, "the rabbit died", came from a test developed in 1931 wherein the urine from a human female was injected into a rabbit. Soon after, the rabbit was euthanized and dissected to check for the reaction of the hormone hCG in its ovaries.

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dop9 TIL The Tomb of the Unknowns has been continuously guarded without interruption since 1937. There are wear marks in the marble from the sentinels footsteps
ANDVw TIL of the first adult themed cartoon "Eveready Harton in Buried Treasure". Exclusively screened at a party for animators, the short was created by 3 of the major animation studios of the day, but because no US film lab would touch it due to its risqué content, the film had to be developed in Cuba.
e0WM4 TIL that Ho Chi Minh, Communist Leader of Vietnam, claimed to have worked as a baker in Boston's Omni Parker House hotel in 1912 and that John Wilkes Booth stayed in that same hotel eight days before assassinating President Lincoln.
8eXQL TIL that when the first rail bridge over the Mississippi River was being planned, riverboat operators pushed for rigid standards in hopes of making the bridge impossible. Instead, the bridge pioneered multiple engineering techniques and still carries road and rail traffic 150 years later.
kJ56d TIL that the 'lump' on your shoulder blade is not a muscle knot - it's the tip of the first rib. Using a percussion massager on this area can increase the risk of causing of long-lasting nerve damage.