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TIL the ridges around the side of the Quarter are a leftover from when the coin was made of silver. The ridges were meant to prevent the practice of shaving off small amounts of silver from the coins.

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dDje9 TIL In the 16th century upper class women wore Visards when outside. The black, oval masks kept their faces from getting tanned, which was associated with the poor. Attached to it was a string with a glass bead a woman would hold in her mouth to keep the mask on.
X0kRQ TIL about the Decebalus Treasure found by a Roman army in 106 AD during the Second Dacian War. Decebalus, the last king of the Dacians, diverted the Sargetia River (in modern-day Romania) to bury all his wealth. Someone betrayed him, and the Romans found 330,000 lb of gold and 650,000 lb of silver.
awG7L TIL that in 1974, a trainee who failed to become a US Army pilot stole a helicopter and buzzed around Washington DC to demonstrate his skills. He intended to personally surrender to President Nixon, and landed on the South Lawn
9wLDX TIL The first deep water submarine rescue occurred in 1939. The submarine USS Sailfish sank off New Hampshire. 33 out of 59 of the crew had survived, trapped in a compartment that had not flooded. A newly developed device called the Mcann Rescue Chamber was used to rescue all the survivors.
E9YX TIL the founder of “Pretty Good Privacy” encryption got around USA’s munition export laws by printing the entire code as a book and claiming 1st amendment rights