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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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neGVr TIL that the term "tire", the rubber component of a vehicle's wheel, comes from the word "attire", from the idea that a wheel with a tire is a dressed wheel.
P95L TIL that Russia has so many dashcams because drivers use them to avoid road rage induced fights, denied hit and run insurance claims, and extortion scams.
JWg1 TIL that Vin Diesel has never met his father, and doesn’t know what race he is.
0d6YL TIL that the Chicago Daily Tribune was so sure in Thomas E. Dewey winning the 1948 presidential election, they printed the next day edition with an incorrect headline "Dewey Defeats Truman".
KYd1a TIL Catnip effects big cats aswell (cougars, leopards, lions, etc.) but 1 in 3 cats are unaffected by catnip and it is a hereditary behavior.