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TIL that it is cheaper to buy and resell a textbook than rent one

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XVy6 TIL Russian ice slides of the 17th century inspired the modern roller coaster. They were wooden structures often 70-80 ft high with ice frozen over a sloping ramp which stretched out 100s of feet. Riders ploughed into a pile of sand to slow them down.
69BKm TIL that in the 60's the Italian Ministry of Education broadcasted a TV show titled "It’s Never Too Late", aimed to teach older people how to read and write. An estimate of 1.5 million people got their elementary school diploma thanks to it.
OorKg TIL that as Drone Bees mate with Queen Bees mid-flight, all blood in the Drone's body rushes to his endophallus causing him to lose control of his body. After inseminating the queen, his body falls to the ground leaving part of his endophallus in the queen.
GYYr1 TIL that "Roshambo" (aka rock-paper-scissors) has no association whatsoever with the Comte de Rochambeau, but came from a 17th century Chinese game translated into Japanese and Anglicized in the 1930's.
gM18 TIL in 1977, a drunk Sid Vicious burst into the wrong studio, confronted Freddie Mercury who was sat alone and snarled ‘Ello’ Fred! Still bringin’ ballet to the masses?’ to which Mercury replied politely 'Ah Mr Ferocious…. We are doing our best, dear’ and shoved him through the door.