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TIL Chinese checkers is actually called Sternhalma and is not related to Chinese culture or the the game of checkers and was invented in Germany in 1892.

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epL6 TIL there is a substance called frozen smoke, it is the world’s lowest density solid, made of 96% air. It supports up to 4,000 times its own weight and can withstand a direct blast from two pounds of dynamite.
Z8xkR TIL about Perpetual Stew, common in the middle ages, it was a stew that was kept constantly stewing in a pot and rarely emptied, just constantly replenished with whatever items they could throw in it.
R57d1 TIL that while postboxes in England, N. Ireland and Wales are engraved with "EIIR" -the royal cipher of Queen Elizabeth II, those in Scotland bear only a Crown; as there was no Elizabeth I of Scotland. The controversial use of "EIIR" on Scottish postboxes lead to the "Pillar Box War" in the 1950s.
eVYL TIL: A man submitted a patent in 1979 that almost perfectly resembles an iPod. He even went as far as predicting a need for DRM and a way to distribute the music.
49v6 TIL Mary Donaldson, a 28-year-old Australian who worked at a real estate firm, met a Danish guy at a Sydney pub in the year 2000. He was Frederik, Crown Prince of Denmark, and she is now the Crown Princess of Denmark.