Rubik's Cube
Erno Rubik was looking for a innovative method of teaching his students about 3D objects and came up with what would be called Rubik's Cube. He patented this clever cube and made millions in the early 80's. There were 43 quintillion combinations of solving the cube, which prompted many books on how to solve the cube. The world record for solving the cube is 16.5 seconds!
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