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TIL some historians call the Seven Years' War World War 0 because of how widespread it was and how many world powers were involved.

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NZVe TIL the LGBT triangle originated during Adolf Hitler’s rise to power. It was used to identify male prisoners who were homosexual. Originally intended as a badge of shame,the pink triangle (often inverted from its Nazi usage) has been reclaimed as an international symbol of the gay rights movement.
GYQP1 TIL the Speed of Light was approximated by Römer back in 1676 using Io’s eclipse of Jupiter. The eclipse occurred 10 minutes after the expectation, allowing the speed of light to be estimated at 220,000km/s.
J1OBQ TIL "The blood of the covenant is thicker than the water of the womb" is a recent and unsourced saying, and nothing indicates it is the true origin of the phrase "blood is thicker than water"
XYyj TIL: in 1987, a high school boy triangulated where fantasy author Piers Anthony lived using fictional maps from his novels, ran away from home to live with him & his family, and was welcomed into PA’s home for the day, spent the night there, and PA listened to him for ~4 hours and gave him advice.
QJp99 TIL In the movie Step Brothers, in the scene where Brennan declares, “Did we just become best friends,” there is a sign in the background for Hugalo’s Pizza. Hugalo’s is the restaurant from which Ricky Bobby (Will Ferrell) delivered pizzas in Talladega Nights after his crash and mental breakdown.