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TIL that mucus gets its green color from an enzyme white blood cells use to make a corrosive chemical called hypochlorite to dissolve bacteria. Hypochlorite is the same chemical used in household bleach.

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lexa TIL that Lena Dunham did not in fact rise from obscurity. She was born to old-money artists and was mentioned in Vogue at the age of 12 and had an article written about her in the New York Times at the age of 16
xVmX5 TIL that Mao Zedong was responsible for more deaths than Hitler or Stalin.Political scientist Rudolph Rummel (1932–2014), a non-China specialist who made wildly higher estimates than any other historian—that Mao was responsible for 77 million deaths.
5Yprp TIL of the Schiphol fly, which is a fly engraved on urinals at Amsterdam’s Schiphol Airport. The psychology is that men will want to "wash" the fly off the urinal so they focus more when urinating, apparently lowering cleaning bills in public bathrooms.
awgKJ TIL that in 1982, 10yo actress Samantha Smith wrote a letter to USSR Gen. Secretary Yuri Andropov asking if he would engage in nuclear war. Yuri invited her to Moscow. She was greeted as a celebrity. She died 3 years later in a plane crash after capturing the attention of the world for her efforts.
vP4vR TIL that Po was the only bilingual Teletubbie. She was voiced by Pui Fan Lee and occasionally spoke Cantonese on the show.