An anonymous reader writes: The greatest geek toy ever invented turns 40 today and to celebrate there's an interactive Google Doodle, and the Telegraph has a short history of the toy. ' There are only a handful of toys that last more than a generation. But the Rubik's cube, which celebrates its 40th birthday, now joins the likes of Barbie, Play-Doh, Lego and the Slinky, as one of the great survivors in the toy cupboard. What makes its success all the remarkable is that it did not start out as a toy. The Rubik's cube was invented in 1974 by Erno Rubik, a Hungarian architect, who wanted a working model to help explain three-dimensional geometry.'