Robots are usually seen as hard-shelled creatures with big motors and strong metal arms. New efforts, however, are exploring how robots can be made of softer materials, like squishy rubber. In particular, researchers at Harvard University are playing with a robot based on the body physics of cuttlefish, including the ability to change color. This creepy creature walks by means of compressed air pumped through its limbs, and can hide itself thanks to special dyes flowing along veins in its body. BBC News has the story.