By Cade Metz and Max Aguilera-Hellweg

WALTHAM: Moving like a large dog, knees bent and hips swaying, the robot walked across a parking lot and into a rain puddle.

There, it danced a jig, splashing water across the asphalt. Then it turned and trotted toward a brick building, climbing over a curb and stopping within inches of a floor-length window. Pausing for several seconds, it seemed to eye its own reflection in the glass.

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