Inventing Rubik’s Cube

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In 1974, a Hungarian architect, Ernő Rubik invented his very popular puzzle. Nearly 50 years later, more than 450 million Rubik’s Cubes have been sold worldwide. In 2015, Ernő told Dina Newman how he came up with the idea and how it became a global phenomenon. (Photo: Rubik's Cube. Credit: BBC)