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TIL of the MARAUDER program, an experimental plasma railgun system that shot lightning balls with "devastating thermal and mechanical shock." It was also said to emit a strong EMP to scramble electronics. It became classified in 1993, with few references to it since.

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x64X0 TIL that in 2009, a campaign succeeded in making Rage Against the Machine's 'Killing in the Name' the Christmas number 1 best-selling single in the UK after the public grew tired of X Factor winners topping the chart every year.
e0m4b TIL that in 1907, French waiters went on strike for the right to have mustaches. In France prior to 1907, mustaches were a symbol of class and stature, while waiters were seen as lower class and thus - not mustache-worthy.
Y71gZ TIL The 1955 Le Mans disaster was a major crash that occurred on 11 June 1955 during the 24 Hours of Le Mans motor race at Circuit de la Sarthe in Le Mans, Sarthe, France. Large pieces of debris flew into the crowd, killing 83 spectators and French driver Pierre Levegh, and injuring around 120 more.
vlMj TIL the collars on men’s dress shirts used to be detachable. This was to save on laundry costs as the collar was the part that needed cleaning the most frequently.
N7RQ8 TIL about the jabuticaba tree, the Brazilian grape tree, it is unusual as the berries grow directly on the trunk. They are so popular in some Brazilian states the sidewalk is actually stained purple from their discarded skins of the fruit.