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TIL Jimmy Stewart was the first Hollywood actor to enlist during WW2 and retired in 1968 as a Brigadier General.

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9YW0D TIL that during World War I, a series of wolf attacks made Russian and German soldiers team up to fight wolves. After seeing wolves attack wounded soldiers and children, the commanders on both sides signed a temporary armistice, and killed hundreds of wolves. They then resumed fighting each other.
JYLjB TIL unicode standard classifies symbols in groups called "planes". Three planes are enough to code nearly all written languages both extant and extinct, music, mathemathical, emojis and game symbols, and there are still 10 planes completely available for future use.
QVre TIL Aaron Swartz, a tech whiz-kid and political activist, tried to liberate almost 5 million restricted articles and $50,000 worth of text books to the public, but ended up facing $1m and 35 years in jail, which ultimately drove him to hang himself.
MenjV TIL that the speed record for a vehicle on rails is no less than 6,416 mph, or Mach 8.4, set by a rocket sled in 2003 at Holloman Air Force Base.
8eGpL TIL that there are five levels of closed-eye hallucinations