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Cheetah robot - a model of speed and efficiency (2:34) 

May 21 - The cheetah is not only the world's fastest land animal, it is also one of the most energy efficient, expending only what it needs to survive. It's that efficiency that engineers at MIT are working to emulate in a robotic cheetah, already clocked as the second fast robot ever developed. Ben Gruber reports. ( Transcript )

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