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TIL crickets actually use stridulation to create their chirp, a way of making sounds through the vibrations of their wings. Similar to running your finger down the teeth of a comb

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Ooy06 TIL: Thor Christiansen, a Serial Killer who was only caught because his fifth would-be victim survived a shot to the head. She recognised him months later in a bar and reported him to police. Law enforcement then linked him with four other then-unsolved murders that had a similar MO.
l40a TIL: 3 US Presidents died from drinking water contaminated with sewage
aKG9 TIL the German word, waldeinsamkeit, has no equivalent in English, and means “the feeling of being alone in the woods”.
QJZx9 TIL Brazil suffered from Hyperinflation in the 1980s-1990s
m1wbY TIL the father of rocket science was a self-educated grade school math teacher