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TIL how trains turn, without a differential. The wheels should create massive friction under the heavy loads. It is solved by conical wheels.

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wEg1 TIL At the urging of radio host Jean Shepherd, listeners entered bookstores and asked for a book that did not exist. So many people took part in this hoax that the book was soon on The New York Times Best Seller list.
D8oY TIL the world’s tallest building was supposed to be called The Burj Dubai, but when they ran out of money, the Sheik of Dubai had to ask his big brother to bail them out. Big brother, known as Khalifa bin Zayed Al Nahyan obliged, but they had to name the building The Burj Khalifa.
J1XQ4 TIL that the idea that medieval castles had clockwise spiral staircases to make it hard for attackers is mostly unfounded. Not only did about 30% of medieval castles have counter-clockwise stairs, the earliest known reference for this claim comes from a book written in 1903, with no primary sources
oBlpo TIL that ???? A menu with no prices in Jon Bon Jovi’s Soul Kitchen.
94m6 TIL that professional bowlers used to out-earn professional football and baseball players.