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TIL that in response to the cholera outbreak of 1854, Chicago engineers decided to install a sewage system by raising the grade of the city by up to 14 feet. That is, they literally put buildings on stilts and buried the new sewer pipes under the buildings.

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DQnGv TIL That to cross the English channel by car you have to drive onto a train.
0571 [TIL] Four months after shooting American Sniper Chris Kyle dead, Eddie Routh confessed “I was just riding in the back seat of the truck, and nobody would talk to me. They were just taking me to the range, so I shot them. I feel bad about it, but they wouldn’t talk to me.”
lnv5 TIL that a group of scientists used mouse skin cells to create stem cells and then used these stem cells to create mouse eggs. These eggs were then fertilized and produced healthy baby offspring. These latter mice were able to have their own babies.
oROYA TIL that Winnipeg, Canada was "mock invaded" by German troops during WWII - 3800 troops, tanks, air-raid sirens and black outs - in an effort to sell Victory Loan bonds.
gML04 TIL putting your hands on your knees after an intense HIIT session is actually better for you than putting your hands on your head, contrary to what coaches have been espousing all these years.