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TIL John Carmack would ask for a medium pepperoni pizza from Domino's Pizza almost every day, during his time at id Software, and it was even carried by the same delivery person for more than 15 years. Carmack is such a regular customer that they still charge him 1995 prices.

6EVe7 TIL that the length of a music single was determined by the weight-driven pulley system on a 1920's recording machine called the Scully Lathe. The pulley allowed approximately three and a half minutes to record before a 100lb weight hit the floor, thus determining the length of a single to this day.
rRvDo TIL While the words concrete and cement are often used interchangeably, cement is actually a bonding agent added to concrete, and they are not the same thing.
4evg TIL a judge dismissed animal-cruelty charges against a police officer accused of sticking his penis into the mouths of five calves in 2006, claiming a grand jury couldn’t infer whether the cows had been “tormented” or “puzzled” by the situation or even irritated that they’d been duped out of a meal.
wLZM7 TIL that during World War 1, the Germans disguised one of their ships as a British ship, the RMS Carmania, and sent it out to ambush British vessels. In a hilariously bad stroke of luck, the first ship it encountered was the real RMS Carmania, which promptly sank them.
YX5G TIL the coldest temperature in the Universe exists on Earth. Magnets of the Large Hadron Collider are cooled to 1.9 Kelvin, colder than deep space.