In this Wednesday, Aug. 3, 2016 photo, research scientist Sung-Jin Park displays a tissue-engineered robot on a piece of glass in a laboratory at Harvard University, in Cambridge, Mass.
Credit: AP Photo/Steven Senne
The idea of taking apart a rat's heart and transforming it into a tissue-engineered stingray first came to Kevin Kit Parker during a trip to the New England Aquarium with his daughter.
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