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TIL the Atkinson Engine cycles through all four strokes in one revolution of the crankshaft.

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ngJP TIL America’s first multi-millionaire, John Jacob Astor, was an opium dealer.
5xMp TIL that Spiral stairs in medieval times were typically wound in a clockwise direction, to place attacking swordsmen (who were most often right-handed) at a disadvantage.
EgWBw TIL Nintendo released a Japan-exclusive game distribution service for the Super Famicom and Game Boy called "Nintendo Power." It allowed players to save up to seven games at a time onto a proprietary flash cartridge. The service lasted from 1997 to 2007.
69XY8 TIL that Olivia Newton-John was granddaughter of the famous physicist Max Born.
PYZ9E TIL That the number zero was invented in India more than a thousand years ago