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TIL Abraham Lincoln is in the National Wrestling Hall of Fame

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via reddit.com

kLe5 TIL that because the concrete of the Hoover Dam was poured into individual, rectangular shaped sections–rather than with a single, continuous pour–the physical dam itself will survive up to 10,000 years and be one of the last remaining visible and recognizable monuments of humans on the planet.
0da5y TIL the US Post Office issued stamp on 13 May 1918 to mark the first official airmail flight, featuring an image of a “Curtiss Jenny” biplane. A printing error caused the plane to be shown flying upside down. Only one "Inverted Jenny" sheet was printed, making those stamps extremely rare.
oRA7R TIL that Bullerby syndrome is a term referring to an idealization of Sweden, which may occur in German-speaking Europe. It consists of a stereotypical image of Sweden, usually with positive associations, including wooden houses, clear lakes, green forests, elk, happy people, and midsummer sunshine.
GYAA5 TIL that Flatworms participate in “penis fencing” where two hermaphroditic worms try to impregnate the other in order to become the alpha male, rather than having to bear children.
8aW5V TIL that plate armor and firearms had coexisted for over 300 years in Europe. Armor had been in an arms race against firearms during that time, and it wasn't until the 16th century that full body armor was phased out in favor of prioritizing protection of vitals.