When I broke my leg I was given a plaster cast. After a couple of months this was removed at the hospital using a rotatory saw. This sliced through the cast with ease, but I noticed that when it touched my skin, it didn’t hurt at all. How is this possible?
In: Biology
It doesn’t actually rotate, it just vibrates back and forth, it ‘cuts’ through the cast because its hard and sturdy, when it hits your skin it does no damage as your skin actually moves with it due to its flexibility.
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