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TIL On June 28, 2009, Stephen Hawking held a party open to all, complete with hors d'oeuvres and iced champagne, but only publicized the party after it was over so that only time-travellers would know to attend; as expected, nobody showed up to the party.

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LkovQ TIL in 1924, a Russian scientist started blood transfusion experiments, hoping to achieve eternal youth. After 11 blood transfusions, he claimed he had improved his eyesight and stopped balding. He died after a transfusion with a student suffering from malaria and TB (The student fully recovered).
Oo75e TIL that in 2005, a chinese man found that he could still buy lottery tickets within a 5 minute window after the winning numbers were announced. this allowed him to win over $4 million. when chinese authorities caught on, he was sentenced to life in prison
1aPO7 TIL about the Chicago Spire, a planned 2000 foot high skyscraper which would have been the highest building in the Americas, and 2nd tallest in the world. It would have looked like a "tall twisting tree" or "blade of grass." It was cancelled in 2008 due to the economic crisis.
9YjEM TIL that the British folk hero king arthur actually fought against the English. In the tale of king Arthur, he is a general and king of the Britons, who were the native Celtic people of England. He fought against the Anglo Saxons, who would go on to beat the Britons and found the country of England.
QJADM TIL the fork was once considered immoral, unhygienic and a tool of the devil.