A woman holds a Rubik’s cube signed by Erno Rubik during an event to mark the 40th anniversary of the puzzle toy at the Liberty Science Center in Jersey City

A woman holds a Rubik’s cube signed by Erno Rubik during an event to mark the 40th anniversary of the puzzle toy at the Liberty Science Center in Jersey City

A woman holds a Rubik’s cube signed by Erno Rubik during an event to mark the 40th anniversary of the puzzle toy at the Liberty Science Center in Jersey City, New Jersey, April 26, 2014. REUTERS/Eduardo Munoz (UNITED STATES – Tags: SOCIETY ANNIVERSARY)