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'Metal Muscles' Flex a New Bionic Hand

Artificial limbs, including the most complex of them – the human hand – are getting more life-like and useful due to constant advances in tiny hydraulic, pneumatic and electric motors called actuators. But now scientists in Germany say the future of the prosthetic hand may be not in motors, but in wires that can ‘remember’ their shape. The human hand is one of the most mechanically complex systems in nature, so making an artificial replica is a daunting task. An ideal prosthesis should be...

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