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TIL while laying underwater cable in the Chicago river a diver discovered a 40ft submarine. Inside he found the remains of a human and a dog. Their identity is still a mystery more than a century later.

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via reddit.com

E1nJX TIL that the ancient Romans used concrete with volcanic ash mixed in, which allowed for much stronger crack-resistant concrete
E1G9o TIL that approximately 99.5% of the 45,000-strong Jewish Community in Lublin were murdered by the SS from 1939 to 1944. Only 230 survived.
kOa1m TIL about Moon Trees. 500 Trees that are planted around the United States from seeds that travelled to the Moon on the Apollo 14 Mission.
rRbgw TIL: The juried art competitions of the Olympics were abandoned in 1954 because artists were considered to be professionals, while (at the time) Olympic athletes were required to be amateurs.
GAYdj TIL chickenpox is a herpes virus