Chemists `program` liquid crystalline elastomers to replicate complex twisting action simply with the use of light
(PHYSorg.com Chemistry)

The twisting and bending capabilities of the human muscle system enable a varied and dynamic range of motion, from walking and running to reaching and grasping. Replicating something as seemingly simple as waving a hand in a robot, however, requires a complex series of motors, pumps, actuators and algorithms. Researchers at the University of Pittsburgh and Harvard University have recently designed a polymer known as a liquid crystal elastomer (LCE) that can be `programmed` to both twist and bend in the presence of light.