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TIL It only takes the first 39 digits of pi to calculate the circumference of the observable universe

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ADo1g TIL the Library of Congress has multiple crowdsourcing projects where anyone can help digitize historical documents. Active projects include transcribing letters and other writings from Rosa Parks, Susan B. Anthony, and Walt Whitman.
m9eM TIL in 1980, a German reporter by the name of Jurgen Heinzpeter, exposed the atrocities of the South Korean government during the Gawngju Uprising. He snuck into Gwangju with the help of a local taxi driver and documented the killing of civilian protesters.
R4Gw TIL In 1906, after 2 years of digging the Hudson River Tunnel, workers for the Pennsylvania Railroad Company connected Manhattan’s West Side with Weehawken, NJ. They met in the middle of the Hudson, completing the tunnel, and the two ends were only off by 1/16 of an inch.
wb5W TIL of Zimmerit, a putty-like coating containing sawdust which some German tanks in WWII were covered with in order to prevent magnetic mines from sticking to them.
6ael TIL that the Bible translation for calling Mary a “virgin” is wrong.