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TIL in 1997, a physics student demonstrating the Leidenfrost effect by holding liquid nitrogen in his mouth accidentally swallowed the substance, resulting in near-fatal injuries. This was the first case in medical literature of liquid nitrogen ingestion

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ynbV TIL Tennessee has an “Unauthorized Substances Tax” which requires “merchants or peddlers” of illicit substances to buy stamps to affix to illegal substances that they sell. Oh and don’t worry, buying the stamps is completely confidential and legally cannot be used as evidence in court.
mxA7p TIL the person who graduates last in his class during the United States Military Academy at West Point graduation ceremony each year is called "the goat" joining an exclusive club which includes Civil War hero General George Custer.
pYEwp TIL the CDC is recommending a "morning after" antibiotic pill to prevent STIs if taken within three days after unprotected sex. The pill significantly reduces the risk of infections like chlamydia, syphilis, and gonorrhea.
LGZV TIL that although there were two deaths at Woodstock (an overdose and someone crushed by a tractor), there were two births as well, netting a zero loss over the three day festival.
7rPxp TIL that 2 rival churches in Vrontados, Greece shoot tens of thousands of fireworks at each other every Easter in a "Rocket War". Both churches then claim victory and agree to settle the score next year. The tradition dates back to the Ottoman era, when real cannons were used instead.