How hard is it to scramble Rubik's Cube?

Rubik's Cube has been one of the world's favorite puzzles for 40 years. Several different methods have been devised for solving it, as explained in countless books. Expert "speedcubers" can solve it in a matter of seconds.

How to solve a Rubik's cube in five seconds

This week, 14-year-old Lucas Etter set a new world record for solving the classic Rubik's cube in Clarksville, Maryland, in the US, solving the scrambled cube in an astonishing 4.904 seconds.

The math of the Rubik's cube

Last August, 30 years after the Rubik’s cube first appeared, an international team of researchers proved that no matter how scrambled a cube got, it could be solved in no more than 20 moves. Although the researchers ...

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