realistically expand and contract just like the real thing.
Even though these artificial muscles are striving to be more like the real thing, they’re 40 times stronger than human muscles and could actually double as suspension systems for robots and use sensors to “feel” external stimuli. Research has even proven that the muscles can build up and store energy, then use that stored electricity to power motion.
"Dielectric elastomers consist of a compliant electrical insulator sandwiched between two electrically conducting electrodes. The insulator is typically made of silicone rubber and the electrodes of carbon grease. When a high voltage is applied across the electrodes, charge accumulates in each electrode leaving positive charges in one and negative charges in the other. These positive and negative charges attract, squashing the insulating membrane, and, because the membrane is incompressible, they cause it to expand in area."
To sum up: their muscles are stronger and will someday be able to ape the natural flexibility and skin movements of our own bodies. Can we go ahead and declare that robots are cooler than humans, already?