MrfixitRik has built the world’s fastest cranking pencil sharpener, thanks to “the power of magnets to make a working Tesla Turbine from 2 CD’s, 4 magnets, and a CD jewel-case.” Video after the break.

Since the turbine itself is capable of over 8000 rpm before destruction, mrfixitrick also shows torture testing of a new clear polycarbonate cover that ensures safe testing.

[via Gizmodo]

*Title fixed, thanks!