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TIL that PETN, a very powerful high explosive, is used as medicine

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9Yoap TIL that in 1928, deep in the Brazilian jungle, Henry Ford built a city nearly the size of Connecticut called Fordlândia. It would last until 1934 when it was abandoned. Its remains are still visible today.
Qnp TIL Canada has more lakes than the rest of the world combined.
awvvy TIL: In Ancient Rome, commoners would evacuate whole cities in acts of revolt called "Secessio plebis", leaving the elite in the city to fend for themselves
WkP9N TIL that while undergoing screening for kidney donation to her son, a 64 yr. old woman found she had no gallbladder and no spleen despite never undergoing surgical removal. The rare birth defect was diagnosed, and she was still able to donate her kidney.
yyNp TIL: that an entire operation theatre from the 1700’s was discovered in the roof of a London church in the 1950’s. The entrance had been walled up and the room undisturbed. The operating table has cuts in it left from amputations and other procedures.