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TIL That Ancient Romans Used Urine for Teeth Whitening and Laundry

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XEgvR TIL that one widely-accepted theoretical cause of some of the largest mass extinction events in history are mantle plumes. They form over millions of years when magma near the earth's core heats up and rises until it reaches the crust, causing widespread volcanic activity over gigantic areas.
e0Q95 TIL that, even after injecting yourself with epinephrine or receiving it from an ambulance in response to an anaphylactic attack, it's still advisable to visit the ER. 20% of the time, patients may need a second injection or other interventions because the first (for whatever reason) has failed.
b9LQj TIL between Nigerian independence in 1960 to 1999 there were a total of 9 military coups (6 of which were successful). That's a coup almost every fourth year!
rR8le TIL Antidote for poisoning consisting of 65 components was named Mithridate after its inventor King Mithridates VI. The King fortified his body with it so well that when he tried to kill himself with poison not to surrender, he failed and had to ask a soldier to pierce him with the sword.
0wX1 TIL North Korea has used Nazi-style human experiments on its citizens in the past and is unknown if they still do so today.