It's not everyday that you combine weird physics with defunct medical equipment and get a success. (Although I would love to see one of those old tobacco-smoke-up-the-butt bellows filled with nitroglycerin.) The thing that looks like a pizza-cutter is a Wartenburg Pinwheel, an old piece of neurological equipment that measures nerve response. It allows a doctor to slowly and systematically run it along a person's body to check for numbness or sensitivity. Today, because it is so difficult to properly clean, it has mostly been retired from medical work.
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