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With the aid of a 3-D printer, researchers have fashioned soft, quarter-inch-long biological robots out of gel-like material and rat heart cells. When the cells beat, the bio-bots take a step.

The robots resemble tiny springboards, each with one long, thin leg resting on a stout supporting leg. The thin leg is covered in the heart cells. When the cells beat, the long leg pulses, propelling the bio-bot forward, according to the research team from the University of Illinois.