LA PLAINE SAINT-DENIS, France (Reuters) —  It’s been over four decades since Hungarian inventor and architect Erno Rubik created his best-selling toy cube, yet it continues to draw thousands to competitions all over the world, including the World Championship taking place this year just outside of Paris. A challenge for some, maddening for others, over the years enthusiasts have found thousands of ways to solve the puzzle. The cube takes its name from its inventor […]