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TIL that "Adagio for Strings" by Samuel Barber was one of John F. Kennedy's favorite pieces of music. The Monday after his death, Jackie Kennedy arranged a performance of the piece by the National Symphony Orchestra. They played it to an empty hall.

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X0kAQ TIL the town of Center in North Dakota was named in 1902 because of its proximity to the center of Oliver County. In 2017 geography proffessor Peter Rogerson used azimuthal equidistant projection to calculate the geographical center of North America only to discover it was Center, North Dakota.
4kYw TIL China has a law that requires cosmetics to be tested on animals. Therefore, many companies have started testing again in order to sell their products in China.
awYGy TIL that in 1978, a Soviet scientist named Anatoli Bugorski stuck his head in a particle accelerator that sent a beam of protons traveling at nearly the speed of light straight through his head. He survived with half his face paralysed & deafness in one ear, completing his doctorate shortly after.
KOnZa TIL inventor of the Murphy-Bed, William Lawrence Murphy (1856-1957), created his first hide-away bed as means to convert his one-room apartment into a parlour, specifically to host the company of his future wife. It was considered inappropriate at the time to for a woman to enter a man's bedroom.
Z89Pa TIL that Tom Wilson, best known for playing Biff Tannen, Griff Tannen and Buford "Mad Dog" Tannen in the Back to the Future trilogy, got so tired of hearing the same questions about his experiences making the films that he wrote a song titled "Biff's Question Song".