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TIL in 1930, Spain printed a series of postage stamps featuring Goya's "Naked Maja" painting. The United States refused all mail sent with this stamp.

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W7dJ9 TIL the first neural network AI computer was built in the 40s by scientists born in the 19th century
M7xPV TIL that during his retirement, George Washington was so intent on staying within 25 miles of his Mount Vernon Estate that he declined to attend the wedding of his nephew Lawrence Augustine Washington.
v16EK TIL There is a community called the "Dozenalists" that believe a base-12 counting system, instead of our current base-10 (decimal) system, is a more efficient way of conceptualizing and understanding mathematics.
4X95N TIL that in Uncanny X-Men #427, it was revealed that mutants can't get AIDS
Ooyp4 TIL Joe Kennedy, JFK's father, made a fortune as a stock market and commodity investor before cashing in all his stocks just days before the stock market crash of 1929. Consequentially, he was one of the few people who vastly increased their fortune during the great depression.