Heart Cells Power This Swimming, Sperm-Like Robot

Say what you will about these sperm-like bio-bots; they've got heart. The beating of live heart cells propels a tail back and forth, so that these self-powered swimming bio-bots—the first of their kind—could one day wriggle through your body delivering drugs. No batteries needed. » 1/22/14 6:20pm 1/22/14 6:20pm