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TIL Bubble lights used for Christmas decorations contain methylene chloride, a carconigenic solvent.

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R7ZJ7 TIL that some firefighters in the US are trained on how to treat aliens in case of an invasion.
ZJyR TIL Winston Churchill, Theodore Roosevelt, and Ronald Reagan’s daughter have all claimed to have seen Abraham Lincoln’s ghost in the White House.
kO9Bm TIL George Hull, an atheist, after an argument about the existence of Giants at a Methodist revival, hired men to quarry out a 10-foot-4.5-inch-long (3.2 m) block of gypsum to fake a giant body was buried. Nearly a year later, he hired 2 persons to dig a well and claim that they have discovered it
kJlE5 TIL the BBC programme "The Black and White Minstrel Show," with white actors performing in blackface, aired for 20 years ending in 1978. Once, in 1967, as an experiment, the network aired a version where black actors performed in whiteface.
rNJvy TIL that reindeer eyeballs turn blue in winter to help them see at lower light levels. (They're golden-colored in summer.) No other mammals are known to have this ability.