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TIL Christopher Columbus used a book of astronomical tables when the next lunar eclipse would take place and use it to warn the indigenous people in Jamaica to treat his crew better or else the moon would rise red. Lunar eclipse happened, and they pleaded Columbus to restore the moon.

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R7eRj TIL that there exists an asteroid 2010 TK7 (diameter- 300 mt approx) which has the same orbit around sun as earth and period close to earth's period of 365.256 days. It oscillates a lot about its mean position and on its closest approach to earth it was around 50 times farther than the moon is.
nQKd TIL of a monk who had taken an old book written by Archimedes, erased the contents, and wrote over it with prayers. Scientists have determined that that monk erased a previously unknown book by Archimedes, that laid out the foundations of Calculus thousands of years before Newton and Leibniz.
yVX9a TIL that for two years, Irish police had been looking for a 'Prawo Jazdy', a reckless driver with over 50 offenses, only to learn that 'prawo jazdy' is Polish for 'driver's license'
VV4Z TIL the first webcam was created to help people avoid pointless trips to the coffee room at the University of Cambridge. The camera provided a live 128×128 greyscale picture of the state of the coffee pot, which was located in the corridor just outside the so-called Trojan Room.
DQEYv TIL after ABC executives & producers encouraged Margaret Cho to go on a crash diet, while filming her TV series All-American Girl in 1994, she lost 30 lbs (14 kg) in 2 weeks. This resulted in her hospitalization for kidney failure & led to major health issues that continued for years after the show.