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TIL that the iconic barber’s pole is representative of when barbers were also surgeons and bloodletters. The red stripes represent the bloody towels drying in the wind.

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0wN81 TIL Pangaea was not the first supercontinent. That honor goes to the billion year old landmass known as Rodinia. The continents routinely split apart and come back together, a process known as the supercontinent cycle.
jYrM TIL We are born with around 300 bones and then it decreases to 206 bones by adulthood after some bones have fused together.
7P9Z TIL Surgeon John Liston amputated a leg in under 21⁄2 minutes. He also cut off the fingers of his assistant; both died from gangrene. He also slashed the coat tails of a spectator, who was so scared the knife had pierced his vitals he died from fright. The only operation with a 300% mortality rate.
WkKP9 TIL that the Ingenuity helicopter uses many off-the-shelf parts including a Snapdragon 801 processor, parts from SparkFun, and Linux. It's also significantly more powerful than the Perseverance rover itself.
Q0od TIL that Darth Vader and Anakin Skywalker were originally supposed to be two separate characters.