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TIL that Elton John considers Metallica's "Nothing Else Matters" to be one of the best songs ever written.

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rdy1 TIL that there is a positive correlation between vitamin D and testosterone levels in men. The more sunlight exposure a man gets the more likely it is that he has elevated testosterone levels.
dLPr TIL Matt Groening hated the Simpson’s/The Critic crossover episode “A Star is Burns”, believing that it “violates the Simpson’s universe”, and was an advertisement for The Critic. He even tried to get the episode pulled from the air, and removed his name from the credits when he failed to do so.
xVaog TIL that after being prohibited from wearing shorts during the hot summer months, bus drivers in Sweden wore skirts to work, citing that since their women coworkers could wear skirts, it would be discriminatory to prohibit them from wearing skirts too.
MJm TIL in the Chinese Manchu tribe mothers give their children blowjobs as a sign of affection
neOWG TIL that our blood is red because it is rich in iron. Some animals have blue blood because it is rich in copper.