So there's now such a thing as a cyborg stingray, a tiny mimic of the real thing that uses living tissues to get around — way cooler than those boring old robot stingrays.
A new class of miniature biological robots, or bio-bots, has seen the light -- and is following where the light shines. The bio-bots are powered by muscle cells that have been genetically engineered to respond to light, giving researchers control over the bots
