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TIL the "black" line of an Etch A Sketch toy merely exposes the darkness inside the toy. Scraping out large "black" areas allows enough light through to expose parts of the interior.

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AD6aB TIL that Humans can hear the difference between hot and cold water being poured. This is because the viscosity of water will go down as temperature increases.
PYGoe TIL rockstar Alice Cooper is an avid golfer. Because golf didn’t fit his “anti-establishment” persona, he used to put on a fake moustache and play on random public courses — until he realized a true “maverick” wouldn’t care what people think.
b9dAE TIL that the Australian slippery road sign is purposely designed to show an impossible situation to make drivers remember the sign more.
JYnnj TIL that a woman mistook some cheese for cocaine and so she hired a hit man to kill a house full of people to steal it. The hit man then turned out to be a cop.
QJMZ6 TIL Roman slaves wore collars of iron with messages like a modern dog collar, for example this one, which reads "I have run away; hold me. When you shall have returned me to my master, Zoninus, you will receive a solidus"