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TIL of the Warren Harding Effect - when we make unconscious assumptions about a person or people and hang on to them even when presented with evidence to the contrary. In the early 1920s, Warren Harding looked so presidential that voters were fooled into thinking he’d make a good president.

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LkLb9 TIL Dandelions are not indigenous to North America and were introduced by European settlers
PYWDV [TIL] William Chester Minor cut off his penis and contributed a lot to the Oxford English Dictionary.
WelY TIL on the set of the ‘The Six Million Dollar Man’ TV show, while the crew was moving a neon-orange mannequin prop, one of the mannequin’s arms broke off revealing it was a human body. The body was identified as Elmer McCurdy, a criminal who had robbed a train and died in a shoot-out with police.
KYg0G TIL that there's a species of wasp called the horse guard wasp. It is found in the eastern US and acts as a natural biological control by hanging around horses and killing horse flies. Despite their loud buzzing noises, horses are not disturbed by them.
WQX TIL that there is a government facility in Vancouver where you can legally inject heroin