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TIL A team of economists at NYU found that getting off Facebook appears to improve people’s lives. Users who deactivated their accounts for a month seemed to enjoy themselves more as a result, showing decreases in depression and anxiety and improvements in happiness and life satisfaction.

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WkWl8 TIL Despite being land locked countries, a Czech-Austrian inventor was the first to use a screw type propeller to power a ship. His ship, Civetta of 48 gross register tons, reached a speed of about 6 knots (11 km/h). This was the first ship successfully driven by an Archimedes screw-type propeller.
kJ6k5 TIL the book on which the movie "The Exorcist" is based was initially a failure. The author lucked out when he was invited as a last-minute guest on late night show, The Dick Cavett Show. Subsequently, the book hit The New York Times best-seller list and was picked up by Warner Bros for the movie.
WkpMB TIL of blindsight, where a cortically blind person can't consciously see but still has visual information subconsciously processed. Such a person may avoid an obstacle in their field of view but not know why they did so.
5QVn TIL Continuum, a magazine devoted to the idea that AIDS is a conspiracy, went out of print in 2001 after all the editors died of AIDS.
ADng7 TIL Hazel Scott played two pianos at the same time with ease. And also, she was the first person of color to get her own national TV show. She will always be remembered for her music and breaking down racial barriers.