Listen to Pallab reading this article Hidden away in a lab in north-west London three black metal robotic hands move eerily on an engineering work bench. No claws, or pincers, but four fingers and a thumb opening and closing slowly, with joints in all the right places. "We're not trying to build Terminator," jokes Rich Walker, director of Shadow Robot, the firm that made them. Bespectacled, with long hair and a beard and moustache, he seems more like a latter-day hippy than a tech whizz, and he