At left is the artificial muscle with no voltage applied. When a voltage is applied, the material expands in width, as shown in the middle (room temperature) and right (high temperature) images.
New 'muscle gel' that's tougher than steel could help scientists create super-strength robots | Mail Online
It may be light as air, but new artificial muscle is no wuss
Carbon Nanotube Muscles Strong as Diamond, Flexible as Rubber | Wired Science from Wired.com
NanoTech Institute - UTD
Flex Appeal: Researchers Create Carbon Nanotube Muscles: Scientific American
Smart Yarns - Scaffolds for growing skin and nerves
Fuel-Powered Artificial Muscles -- Ebron et al. 311 (5767): 1580 -- Science