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TIL that the mild and much more common first stage of frostbite, the numbing and reddening of the skin, is called frostnip.

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via reddit.com

4kMQ5 TIL: the first dirty bomb was created and tested by the communist Red Guard for use against the PLA
ZpvRB TIL John F Kennedy was a WW2 war hero. In 1943 the torpedo bost he was in command of was struck by a Japanese destroyer. When the boat sank, Kennedy swam a critically injured crew member 3.5 miles to shore. They were rescued by writing a message on a coconut husk.
vPbx TIL in 1848 an iron rod exploded through the skull of a railroad foreman and landed 80 feet away. He was speaking and walking minutes later. The doctor didn’t believe him until a “teacupful of the brain” fell on the floor. He died 12 years later, after having portraits made of him holding the rod
6bBw TIL When France set off its first nuclear weapon, it made it more powerful than all the other nation’s first weapons combined. Then set it off in a remote part of Algeria. While they were at war with each other.
d8vQ7 TIL the US Navy wanted to turn Wisconsin into the world's largest antenna