The Rubik's Cube dates to my childhood, when it was for leaving on a desk to be fiddled with — or, for a select few strange birds, for actually solving, sometimes very quickly. At that time, knowing ...

The simple Rubik's Cube is a harder problem than most people realize. Using the currently provided best algorithm for solving the cube, for example, would take the computer you're reading this on now ...

I make short, to-the-point online math tutorials. I struggled with math growing up and have been able to use those ...