PEOPLE Magazine 40th Anniversary

Look Who's Turning 40

From Leonardo DiCaprio and Victoria Beckham to Hello Kitty and Happy Days, see who's celebrating the milestone with PEOPLE

RUBIK'S CUBE

In the years since Hungarian sculptor and professor Erno Rubik dreamed up the 3-D puzzle, people are still trying to solve the cube's tricky design. Considered the world's best-selling toy, the Rubik's Cube has remained such a cultural touchstone that even Justin Bieber couldn't resist the urge to solve it on live television.