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TIL happy cows actually do produce better milk. Higher levels of serotonin (a chemical associated with feelings of happiness), led to improved blood calcium in cows, reducing chance of disease and improving nutritional quality of the milk.

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YpgWG TIL in 2012 a schizophrenic inmate named Darren Rainey died after he was put in a 180 °F (82 °C) shower for two hours. His skin reportedly "fell off at the touch". Two officers who were on duty at the time later received promotions and nobody has ever been charged.
D1jOY TIL there are 23 floating-year-round boat schools in Bangladesh due to constant flooding in the country. Starting in 2002, these schools ensure year-round education in a country where heavy monsoon rains can submerge 70% of the land mass under water.
4kaPg TIL of the Astronomical Unit, or AU, a unit of length equivalent to the distance between the Earth and the Sun, measuring 149,597,870.7 kilometres exactly. It's also a fundamental component in defining another unit of astronomical measurement, the parsec.
P1ENE TIL Professional wrestler Scott Hall was diagnosed with post traumatic stress disorder, years after killing a man in self defense. Hall wrestled away the drunken man’s gun, and shot him in the head, outside of Hall’s place of work.
jdGX TIL that in 1586 a pregnant widow wrote a letter to her partner, who had died at the age of 30. This was found by archaeologists in South Korea in 1998, intact with the man’s mummified body and a pair of sandals woven from hemp and the woman’s hair.