Spot the four-legged robot has already proven adept at dancing, running,  and err, falling over — and the old dog is still learning new tricks. Boston Dynamics has given Spot a new robotic arm that can grasp, carry, place, and drag a variety of objects. The secretive firm today showed off Spot moving tools, pulling levers, opening doors, and closing valves, at a launch event for a new lineup of the robots. The arm can manually or semi-autonomously perform physical work or act on data insights at construction sites, underground mines, power plants, and offshore rigs. [Read: How much does it cost to…

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