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TIL speed limits are sometimes for air quality reasons

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Ywed TIL a domestic sheep’s wool will just keep growing and growing forever, if humans don’t cut it off
P1NEO TIL The most powerful microscope in the world is the Titan Krios. A 12-foot cryogenic transmission electron microscope (cryo-EM), which costs upward of $6 million. It is the most powerful and flexible high-resolution TEM for 3D images of biological samples.
l7WaG TIL the term Heimweh (homesickness) was coined in the 17th century for Swiss mercenaries. It was seen as a medical condition that supposedly only affected the Swiss—until the 19th century, when it was recognized as universal.
9RYQ TIL That Canada is the only host nation in the history of the games not to win a gold medal in their own Summer Olympic Games (Montreal 1976)
EK5o TIL that Miyamoto Musashi, a Japanese rōnin born in the Tenshō era, had such faith in his own swordsmanship that he used a wooden sword regardless of the foe’s weapon. Additionally, Miyamoto killed an opponent with a sword that legend says he carved from an oar.