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TIL That the Great Wall of China is also known as “The Longest Cemetary On Earth” because it is filled with bodies of the workers who died during its erection

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lZNr TIL: Due to the detonation of atomic bombs, everything on Earth was marked by a unique carbon signature. It can measure the date of anything from wine to human tissue.
awWAy TIL Canadian researchers developed an implant which restores the movement of patients with advanced Parkinson's disease who have trouble walking, freezing on the spot and falling. By electrical stimulation to the spine via the implant, the signal reawakens the feedback from legs to brain.
EgP47 TIL there's a fishing line strung between electrical poles that travels continuously around the entire perimeter of manhattan
eYD4 TIL that one of the signers of the U.S. Declaration of Independence had Cerebral Palsy. He signed the document, while holding his right hand with his left, saying “My hand trembles, but my heart does not.”
aDAZ TIL Apollo 11 Astronauts couldn’t get life insurance prior to their launch so they gave themselves their own “life insurance policy made of autographs” that could be sold by their families if they did not return.