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TIL of the Davy Crockett - a cold war recoilless infantry mini-nuke.

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RQXl TIL that the word “ok” as we know it today, as a synonym for “alright”, is only about 175 years old. It was originally written as a joke that went viral in 1839 by a Boston editorial writer satirizing people’s bad grammar and use of abbreviations, and was an abbreviation for “oll korrect”.
m1Pop TIL the first submersible, the USS Turtle, was built in 1775.
4keYX TIL that LaMarcus Thompson, the father of the American roller coaster, invented the first coasters on Coney Island because he thought the world was too sinful and needed more moral entertainment
KOX74 TIL that heavy metal band Black Sabbath started as a blues band called Earth, but changed their name after seeing the Boris Karloff horror film "Black Sabbath". They liked "that people paid money to be frightened".
7r4YZ TIL The Roland 808 drum machine was commercial and critical flop because it didn't produce a realistic drum sound. However, its 'unusual' synthetic beats and effects made it a cult favourite among EDM and hip-hop artists, which eventually turned the 808 into the icon it is today.