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The Disease Biophysics Group at Harvard, led by Kevin Kit Parker, created a tissue-engineered soft-robotic ray that swims using wave-like fin motions, and turns according to externally applied light cues. Source: "Phototactic guidance of a tissue-engineered soft-robotic ray" Science, 2016, DOI: 10.1126/science.aaf4292 http://scim.ag/29lax1u