BERLIN, GERMANY - MAY 11:  A stand host demonstrates a robotic prosthetic arm developed by UK startup Open Bionics mimicking his finger movements at the CUBE Tech Fair for startups on May 11, 2017 in Berlin, Germany. The CUBE Tech Fair is showcasing the projects of startups from across Europe and is running from May 10-12.  (Photo by Sean Gallup/Getty Images)

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