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TIL that Leo Marks, a WWII cryptographer, suspected that Germans had infiltrated the Dutch network in 1943 because all messages were being sent without any errors. To test his theory, Marks sent a message with "HH" and received "HH" in response. "HH" was a common German sign-off for "Heil Hitler."

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W71RX TIL of 'Roofman', a robber and fugitive who gave stolen toys to kids, had a secret lair at a Toys R Us. At night at Toys R Us he rode bikes, raced remote-control cars on the roof, ate baby food, and changed employees' work schedules. He told his girlfriend and others he had a secret government job.
4XnDo TIL that Nazi commander Walter Rauff escaped justice for the deaths of nearly 100,000 people during WWII. He was instrumental in the implementation of the Nazis' genocide by mobile gas chamber. He died in 1984 from a heart attack as a free man in Chile. His MI5 file said he never showed any remorse.
npjG TIL that the French lost more men in battle during the American Revolution than the Americans did.
QJK6k TIL: Larry McMurtry wrote the novels for the movies "Hud", "The Last Picture Show", "Terms of Endearment", "Brokeback Mountain", and is still living in the town he was born in, in Texas.
MevXa TIL that every year, a regatta is held in Alice Springs. Due to the lack of water in Central Australia, contestants have to carry bottomless "boats" trough a dried-out river. When the river did carry water in 1993, the regatta became "the only regatta ever cancelled because of wet weather".