Invented in 1974, patented in 1975 and released for sale in Hungary in 1977, Rubik’s Cube could certainly be considered to have reached its 40th birthday this year. To celebrate, inventor Ernő Rubik has helped put together a special exhibition at Liberty Science Centre, New Jersey, celebrating the history of the hexahedral enigma. The exhibition, called ‘Beyond Rubik’s Cube’, opens on 26th April for several months.