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Flesh and bone triumphed in the first ever man-versus-machine battle of brawn - an arm wrestling contest between robots and humans in California on Monday.
The champion, beating all three robotic arms each in matter of seconds, was a 17-year-old girl called Panna Felsen, a high school student from San Diego, US.
The contest was set up by Yoseph Bar-Cohen at NASA's Jet Propulsion Laboratories in Pasadena, California, US, in an attempt to encourage the development of polymer-based artificial muscles. The aim, he says, is to improve on existing actuators - or muscles - currently used in prosthetics and robots.
The actuators in the three competing robotic arms belong to a class of materials known as electroactive polymers (EAP). These are plastics that can change shape when activated either electrically or with chemicals.
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