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TIL in the 1980s millions used the Walkman during exercise helping to mark the beginning of the aerobics craze. During the height of the Walkman's popularity, between 1987-1997, the number of people who reported that they walked for exercise rose by 30%.

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9w68Q TIL the WWE ran a video introducing wrestling star Dominik talking about his time as a hardened criminal while standing in front of a picture. The WWE drew backlash after fans recognized the image as a photo of a concentration camp in Poland. The WWE apologized for the mistake.
awrrN TIL that the man responsible for inventing leaded gasoline, Thomas Midgley Jr, was also accredited for the introduction of the ozone depleting refrigerant Freon. Later in life, Midgley contracted Polio and subsequently died when he was strangled by the very device he designed to get him out of bed.
e0wd4 TIL James Watt needed to convince skeptics to ditch their draft horses&buy his steam engine. To prove its superiority, he measured a horse walking in ­circles to turn a grindstone in a mill. He multiplied distance it walked by its ­~180 pounds of pulling force&came up with a new measure: horsepower
8aw04 TIL When tickled, rats laugh ultrasonically.
77Rp TIL American outlaw Billy the Kid was fluent in Gaeilge (the Irish language) and he once acted as a translator for the daughter of an Irish ranch owner when she needed to converse with American ranch hands because she was only fluent in Irish