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TIL In the middle half of the nineteenth century, more than one-half of the population of Ireland emigrated to the United States

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NXkgM TIL that chainsaws were originally invented to help with childbirth.
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a8pdM TIL of Ticker Tape Synesthesia, or seeing words in writing as they're spoken, sort-of like a news ticker or subtitles. There's no known cause, but it's thought to result from excess inter-connectivity of neurons in the different sensory regions of the brain.
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9odm TIL physicist Bernard Waldman witnessed the bombing of Hiroshima, as a camera operator on the observation aircraft. He was equipped with a special high-speed movie camera with six seconds of film to record the blast. Unfortunately, Waldman forgot to open the camera shutter, and no film was exposed.