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A child tries to solve Rubik's Cube with feet at the 2019 Osijek Open speedcubing competition in Osijek, Croatia, on Feb. 24, 2019. (Xinhua/Dubravka Petric)

A child tries to solve Rubik's Cube with feet at the 2019 Osijek Open speedcubing competition in Osijek, Croatia, on Feb. 24, 2019. (Xinhua/Dubravka Petric)