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TIL that In October 1971, a physicist and an astronomer took 4 cesium-beam atomic clocks aboard commercial airliners. They flew twice around the world and when reunited, the sets of clocks were found to disagree according to the predictions of the relativity theory

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8adOK TIL the worst human stampede in Britain was when 183 children were crushed to death in a stairway rushing to collect gifts from the entertainers after a variety show, in June 1883
R5gQ8 TIL that the "moving sofa problem" is an unsolved problem in mathematics. The "sofa constant" is the size of the largest object that can fit through a hallway with a right turn, and is somewhere between 2.2195 and 2√2
9Y6KG TIL the tree planted in memory of George Harrison, lead guitarist of The Beatles, died after being infested by beetles.
9wdOQ TIL: The last imperial eunuch of Chinese history was castrated by his father with a razor to serve the last emperor Pu Yi. However, just mere months after the operation, the emperor was deposed and the system of government changed.
gMWV7 TIL Christmas was banned in Boston from 1659 to 1681