"We have to try and test to find this optimisation of friction, of back-driveability," says David Kehr, president of humanoid robotics. "It's really a big puzzle."
To discover more fascinating science content, head to bbc.co.uk, search for BBC Inside Science and follow the links to The Open University.
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Exclusive: memo came after Mike Huckabee’s remarks about Israel sparked alarm inside White House
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