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TIL a young woman's head swelled from her usual measurement of 22 inches to 24.8 inches (and the shape of her face changed) after she used hair dye. This was because the hair dye had a chemical in it called PPD (paraphenylenediamine), which can cause serious allergic reactions in certain people.

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x67j0 TIL the first American woman to go to medical school was admitted as a joke. The students at Geneva Medical School thought it was joke when Elizabeth Blackwell applied to attend in 1847, so they decided to accept her. She graduated in 1849, started own practice, and opened an infirmary for the poor.
W7ojN TIL an amateur archaeologist discovered European cave paintings used a proto-writing system meant to convey the gestation period of the various animals they painted by using dots to indicate the lunar cycle.
XxVP TIL The Savannah is the largest domestic cat breed. It resembles a small leopard and behaves like a dog.They can grow up to 40 lbs, have an eight foot vertical jump, and can be trained to walk on a leash and play fetch.
rOMo TIL at least two high-profile MLB players practice urinating on their hands with the belief it toughens their skin.
8aOka TIL when in the 80s cheaper brands were lowering Intel's market share, the brand didn't know how to convince users to buy Intel-based PCs. But one retailer told them it would be enough to just tell people computers had Intel chips - and their idea, "Intel Inside" campaign, was a big sales success.