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"We've made an artificial muscle that, when you apply electricity to it, it expands" more than 200 percent, said Qibing Pei, a scientist at the University of California, Los Angeles and study author. "The motion and energy is a lot like human muscles."
As the material contracts after an expansion the rearranging of the carbon nanotubes generates a small electric current that can be captured and used to power another expansion or stored in a battery.