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When you flex a muscle in your arm, it’s not the muscle that’s shrinking, but the cells that comprise it. Each cell lining the muscle’s length has its own limited contractile ability, one driven by tiny motor and ratchet proteins that crumple up a cell and refuse to let it relax. Rather than being a single continuous muscular action, your ...

NASA’s Johnson Space Center (JSC) has finally unveiled Valkyrie, its “superhero robot” entry to the DARPA Robotics Challenge (DRC) Trials, which take place on December 20 in Florida. Valkyrie will compete against fellow humanoid robots, such as Atlas, on a series of eight physical tasks to test the dexterity and autonomy of the robots, with the chance of going forward ...