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"For a long time, roboticists have used DC [direct current] motors to make robots move," says Mike Tolley at the University of California San Diego.
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Monday’s snowball fight, which appeared to be organized by social media content producers, caused a chaotic scene as a large crowd amassed at the popular park to wing snowballs at each other during a winter storm.
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And she's watched plenty of astronauts follow in her footsteps. Does she have any advice for the next generation dreaming of the stars?