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TIL of the Euphemistic Treadmill whereby euphemisms, which were originally the polite term (such as STD to refer to Venereal Disease) become themselves pejorative over time.

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8DQa TIL that the world record for the most consecutive push ups (i.e. nonstop) by a man was 10,507 reps in 1980 and 302 reps by a woman in 2014
p8Wg4 TIL Bill Gates’ mugshot was used to create the Outlook 2010 default profile picture
PYBe TIL that the long safety grooves in concrete were originally designed by NASA and have reduced highway accidents by 85%
Z8dQQ TIL Biting on the aluminum foil can be painful and is usually noticed if you have metal in your mouth from dental work (e.g. fillings, crowns). Basically, when you bite on foil, you set up a battery in your mouth and the electrical current stimulates nerve endings in your tooth.
Oown1 TIL of an early variation of the jockstrap, called the "suspensory". It was developed in the 1820s as way to lift the scrotum away from the saddle. General Custer's suspensory is on display at the Little Bighorn Battlefield National Museum.