The Rubik’s Cube is the best-selling children’s toy in history. It was invented in 1974 by Erno Rubik, an architectural design professor who used the cube to teach his students how to analyze design problems in three dimensions.
But before his students could use the cube, Rubik had to figure out how to solve it himself. That posed an immense challenge. The Rubik’s cube has over 43 quintillion combinations. To put that number into perspective, if everyone on earth did one combination a second, all 43 quintillion combinations would take almost 200 years.