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TIL the ancient greeks thought the body was regulated by four humors (juices): blood, yellow bile, phlegm and "black bile". In a healthy body they were in the right proportion to each other, an imbalance was thought to be the cause of diseases. From these humors we still have words like sanguin or

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rNk1M TIL about Lake Natron in Tanzania, which is so dangerously alkaline thanks to the magmatic limestone from a nearby volcano, any animal that dies and falls in is mummified. The only animals that go there are lesser flamingos, who use it as a mating ground, and even they sometimes die.
VMDMp TIL that birds' navigational abilities may result from quantum mechanics. This theory suggests that the entanglement of 2 electrons on molecules in their eyes helps them detect Earth's magnetic field
69QZJ TIL, that Jimmy Carter's father, whipped the young Jimmy Carter for stealing a penny out of a Church Collection plate. He later remarked that it was the last money he ever stole.
KewJ TIL that 2 men in the 1920’s ate nothing but meat for an entire year so doctors could study them … despite consuming high calories and being sedentary all their health markers stayed the same or improved
GYOr4 TIL the US Navy commissioned an Arleigh Burke class Destroyer named after Sir Winston Churchill, only the fourth time a US Navy ship to carry British citizens name.