World's lightest material made into muscle

The lightest material on Earth now packs a powerful punch. Scientists from Texas and around the world have created a material that, by density, is lighter than air yet, when electrified, instantly and powerfully contracts. Their work is detailed in this week's issue of the journal Science. "These artificial muscles are very lightweight and can do wonderful things," said Ray Baughman, the study author from the University of Texas at Dallas. While the artificial muscle is unlikely to be used in humans or prosthetic limbs, Baughman says "these sheets of carbon nanotubes ... are of great practical interest for LEDs, solar cells, and other applications."