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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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P1exG TIL because of tidal forces, the moon completes one revolution every 655 hours. So one "side" of the Moon is always facing the Earth, and the other "side" is always facing away from the Earth. On the surface of the Moon, you would experience 327.5 hours of sunlight and 327.5 hours of darkness.
yXga TIL that Belgium is building a beer pipeline that will move 1,500 gallons of beer per hour
JYram TIL a Peacock is a male Peafowl. A Peahen is a female, and together they have Peachicks.
O8DL TIL the first coin minted by the U.S. had “Mind your business” on one side and “We are one” on the other
v1bpx TIL A member of the Church of the Flying Spaghetti Monster was denied the right to wear a colander in ID photos in Holland. Pastafarianism is considered a 'satire' and not a 'serious faith.'