Self-driving robot can run indefinitely on harvested power :

A self-driving robot that weighs about the same as a raisin only needs surrounding light or radio waves to run indefinitely.

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University Of Washington , Washington , United States , Spain , Allen School , Madrid , Zachary Englhardt , Kyle Johnson , Shwetak Patel , Vikram Iyer , Amazon Research Award , Space Grant Consortium , National Science Foundation Graduate Research Fellowship Program , Google Research Scholar , Computer Science , Grant Consortium , Machine Endowed Fellowship ,