The Tesla turbine is a bladeless centripetal-flow turbine invented by Nikola Tesla in 1913, using the boundary-layer effect rather than having a stream of gases or a fluid impinge on blades.
Using a CD jewel case, some magnets and a 12-volt air compressor, you can build an elaborate Tesla turbine sharpener for pencils you probably don’t even use. Oh, did I mention it could kill you?
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