"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."
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His industry accolades include five Grammy awards, induction into both the UK Music Hall of Fame and the Rock and Roll Hall of Fame - both with Black Sabbath and as a solo artist, in separate years - and the Ivor Novello Award for Lifetime Achievement, with Black Sabbath.