"This is the coolest thing you're going to see all year." This soft robotic stingray is made of rat heart muscle. Yeah, it's just as crazy as it sounds. "Roughly speaking, we made this thing with a pinch of rat cardiac cells, a pinch of breast implant, and a pinch of gold. That pretty much sums it up, except for the genetic engineering," says Kit Parker, the bio-engineer at Harvard who led the team that developed the strange robot.
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