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TIL that the chainsaw was originally invented as a "tool" to aid childbirth. It was in an operation known as a symphysiotomy, a risky and grossly outdated surgical procedure to widen the pelvis and make the childbirth process a bit more likely to occur.

Read more science.howstuffworks.com

via reddit.com

6ReJ TiL: That it is considered unlucky to be the third person to light a cigarette. During World War One, soldiers thought that the enemy would see the first light, take aim on the second, and fire on the third, killing the soldier.
wLk71 TIL that lemurs use a certain kind of millipede to get high. The millipedes also act as a kind of insect repellent too, keeping mosquitos away from the lemurs for a bit
kERB TIL although ‘Piano Man’ is Billy Joel’s nickname, considered his signature song, and plays it as his finale at his concerts, the song did not even reach billboard’s top 10.
aR9J TIL Vicar’s Close in Wells, England is the oldest purely residential street with its original buildings all surviving intact in Europe.
ekGE TIL the Chocolate River in Willy Wonka and the Chocolate Factory was actually made of chocolate cream, and eventually turned rancid