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TIL Admiral Karl Dönitz would contact U-boats under his command up to 70 times a day to ask them about their position, fuel levels, and other minutiae. This frequent contact between Dönitz & his U-boats helped the Allies to break German ciphers

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worGo TIL that the extinct Ubykh language, spoken in the Caucasus until 1992, holds the record for most consonants: it had 83 but only two vowels
OogvR TIL Jules Verne's shelved 1863 novel "Paris in the Twentieth Century" predicted gas-powered cars, fax machines, electric street lighting, maglev trains, the record industry, the internet. His publisher deemed it pessimistic and lackluster. It was discovered in 1989 and published 5 years later.
awmpM TIL, that some dogs can understand what we are saying
epAWn TIL about the Théâtrophone, a 19th-20th century "theatre phone" system that let subscribers listen to live opera and theatre performances over telephone lines.
0w8lN TIL that Sitting Bull's remains were stolen from the Standing Rock Reservation, by his granddaughters, and buried in Mobridge SD. There a monument of Nancy Kicking Bear, a granddaughter of Sitting Bull, was erected.