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US experts have developed what they say are the most biologically-accurate robotic legs yet. Writing in the Journal of Neural Engineering, they said the work could help understanding of how babies learn to walk - and spinal-injury treatment. They created a version of the message system that generates the rhythmic muscle signals that control walking. A UK expert said the work was exciting because the robot mimics control and not just movement.

When the founders of GitHub moved into their swank South-of-Market loft last year, the first thing they did was redecorate. They turned the floor's biggest office into a parody of an executive suite - complete with fake fireplace, plush leather chairs, and a wooden globe that slides open to reveal a bottle of single malt scotch. Hanging from the wall is a painting of a cat, dressed as Napoleon, with five octopus-like legs. They call it the Octocat.