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
They probably used a form of cut off disc. These don’t have teeth like a wood cutting blade and use abrasives like diamond. The abrasives are usually fine enough that it won’t hurt your skin unless you press it in with some force. Think of it as a very thin, fast moving sanding disc.
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