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TIL after Galileo discovered the 4 largest moons of Jupiter, he sought the patronage of the Medici family and proposed naming the moons after their 4 sons. However, the names Io, Europa, Ganymede, and Callisto—based on the names of Zeus’ lovers—were later popularized by the astronomer Simon Marius.

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7rdrZ TIL "Yankee Doodle" was written by the British to mock americans. "Doodle" is thought to come from the German "dödel", meaning "fool" or "simpleton" and "macaroni," a flamboyantly stylish type of dress, painting the Yankees as morons who thought placing a feather in one's cap made them a "dandy."
YpAeW TIL that everyday flour can be a propellant for an explosion. If a cloud of flour reaches a critical concentration in the air it forms an explosive mixture.
jRGn TIL that if your second toe is longer than your big toe it is a condition called Morton’s Toe and that some statues, including the Statue of Liberty, have feet sculpted that way.
0dEMv TIL that the national anthem of the Netherlands, "Wilhelmus van Nassouwe", known simply as "Wilhelmus"; is the oldest national anthem in the world dating back to the late 1560s.
YpWg7 TIL that two straight men got married to avoid paying higher taxes