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TIL of Smoky, the tiny four-pound Terrier dog who served and assisted the US in WW2 after being found abandoned in a foxhole in New Guinea , and who later became histories first therapy dog.

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OGYR1 TIL of the Superman memory crystal, a nanostructured glass used for permanently recording digital data. It can store up to 360 terabytes worth of data for billions of years. It is so durable that even at 189 °C (372 °F), its decay time is comparable to the age of the Universe (13.8×10^9 years).
Me41K TIL that same-sex sexual activity is punishable by death in Iran, but Iranians can get a state-sponsored sex change operation to avoid punishment. Iran performs more sex reassignment surgeries than any other country in the world after Thailand.
wonlW TIL that Africa is home to more than 2,000 languages including more than 500 in Nigeria alone
VMDB TIL that the digits of your fingers are sized roughly by the golden ratio. But even cooler, when you uncurl a fist, the trajectory of your fingertips follow the golden spiral.
Z8XL4 TIL that The New York Times Best Seller list is made up by editors and has nothing to do with the actual number of books sold