Mars rover hits rocky snag with power tool

NASA's Curiosity Rover got a rock stuck to the drill at the end of its robotic arm, necessitating some remote-controlled shaking and jiggling to free the tool. We've all been there, doing a bit of do-it-yourself with a power tool when something awful happens. It might be hitting a pipe while drilling a hole for a Rawlplug. Or punching through a...

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