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TIL the shape of chainsaw teeth are based on the mandibles of wood-boring beetle larvae.

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gMZbL TIL Mark Twain was incredibly well traveled and wrote "Travel is fatal to prejudice, bigotry, and narrow-mindedness, and many of our people need it sorely on these accounts. Broad, wholesome, charitable views of men and things cannot be acquired by vegetating in one little corner of the earth..."
jEWR TIL that Europeans traditionally swam the breaststroke, while Native Americans swam the front crawl. When two Native Americans won an 1844 swimming competition in England, newspapers criticized their barbaric, “un-European” form. Europeans refused to use the faster front crawl for decades.
Bg7YW TIL that if you drilled a hole through the center of the earth from Formosa Province in Argentina, you’d end up on the island of Formosa. This was not known when the two places were named in the 1500s.
eGwE TIL that in 2002, a high school student ‘inspired by 9/11’ flew a stolen Cessna plane into the Bank of America building. He was the only casualty.
e0EjE TIL that in 1625, a restoration of the Sistine Chapel was carried out by Simone Lagi, the "resident gilder", who wiped the ceiling with linen cloths and cleaned it by rubbing it with bread. His report states that the frescoes "were returned to their previous beauty without receiving any harm".