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TIL of a family that lived in Kentucky know as the Blue People of Kentucky. This family is notable for carrying a rare genetic trait that leads to the disease methemoglobinemia, which gives the affected person blue-tinted skin.

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via reddit.com

5YOZ8 TIL: The rivalry between Adidas and Puma became so fierce that the German town of Herzogenaurach (where both companies had their HQs) became known as "the town of bent necks", as no local would start a conversation with another without first looking down to check which firm's shoes they were wearing
5Y5w9 TIL that the US has spent over $4.79 Trillion on wars in Iraq, Syria, Afghanistan and Pakistan and the Department of Homeland Security through 2016
R76b7 TIL in the anatomy building at Dalian Medical University, where medical student can practice on cadavers, there's a sign with a quote from a donor that reads "I’d rather let students try something 20 times on me than see them make one mistake on a future patient.”
o0pr TIL that astronomers and geologists have discovered evidence that Mars once experienced massive tsunamis, some of which had waves over 400-feet-tall.
LJWQ TIL Touching stainless steel can remove the smell of onions from your fingers.