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TIL in medieval times the Japanese used to dye their teeth black. It also acts as a dental sealant to prevent tooth decay. The reason for this was objects that were pitch black, such as glaze-like lacquer, were seen as beautiful.

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x6E0w TIL Married With Children never had canned laughter. They filmed in front of a live audience that reacted to the scenes. That's why there's sometimes long, awkward pauses when they waited for the production team to shut down the audience.
wLYoY TIL scientists don't fully know how acetaminophen (aka Tylenol) actually works
OoaG1 TIL that we say "redhead" since red was the only relevant color word in Old and Middle English. Oranges arrived in England after 1300 AD and only became a color descriptor after 1540. Carrots arrived in 1530 but were purple and yellow at the time, as orange carrots were only popularized after 1600.
l06N TIL it snows on Mars
xaOo TIL in the scene in Inglorious Bastards where Dianne Kruger is being strangled it was actually Quentin Tarantino choking her out because he thinks that fake strangling never looks real in movies.