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TIL Rotationplasty is a surgical procedure where, in case of bone tumor, they remove a child's lower leg, rotate it 180 degree and attach it to a thigh bone in a way that makes an ankle joint serve as a "new knee". It looks like having one leg shorter and rotated back.

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ANpea TIL you should brush your teeth before breakfast or wait 30 minutes after to protect enamel
5Yp09 TIL people with nerve damage in their fingers don't get "prune fingers" when soaked in water. This is because wrinkling is a reflex of the autonomic nervous system which causes blood vessels under the skin to constrict. This reflex is theorized to have evolved to improve our handling of wet objects.
4Jba TIL a study in Australia found that using roundabouts instead of stop signs/signals resulted in a 75 percent reduction in injury collisions, a 90 percent reduction in fatality collisions, and when long term costs were considered cost around the same.
QZlp TIL Steve Jobs was effectively paid $5,000 to create the game Breakout. Steve Wozniak worked for four straight days without sleep to reach the deadline, which wasn’t real, but something Jobs made up. Wozniak only received $375 while Jobs bought a farm in Oregon
kJK5 TIL that Mark Twain appeared on film only once. The footage was shot by Thomas Edison in 1909, a year before Twain’s death. In addition, there exists no recording of Twain’s voice.