Stock Photo - A participant of the German championship in speedcubing solves the so called 'magical'-cube in Duesseldorf, Germany, 23 November 2013. Almost 100 participants attend the different disciplines. In 1974 Ernoe Rubik invented the cube to tutor his students three-dimensional understanding. Photo: Bernd Thissen/dpa | usage worldwide. - Duesseldorf/North Rhine-Westphalia/Germany

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