Mathematicians and hobbyists have had a half-century of fun exploring the 43 billion billion permutations of Erno Rubik’s creation. “My method was understanding,” Erno Rubik said of the iconic twisty ...

Some toys never go out of fashion. Celebrating its 50th anniversary this year, Rubik’s continues to be the most popular puzzle cube brand in the world, with around 500 million sold, according to Yahoo ...