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An employee of Germany's biggest retailer Metro AG takes a selfie with HI-4, a life-size humanoid robot, at Metro's headquarters in Duesseldorf, Germany, June 7, 2016. The android, modelled after its Japanese inventor Hiroshi Ishiguro, a professor at Osaka's University, is made of a metal skeleton, plastic skull and silicon skin; and can be used as a human substitute for interaction via a tele-operated control system. (Photo by Wolfgang Rattay/Reuters)
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