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Jeffrey D. Allred, Deseret News
University of Utah mechanical engineering student Spencer Perry, left, shows the team's human-powered vehicle during Design Day in Salt Lake City Tuesday, April 16, 2013.

SALT LAKE CITY — University of Utah mechanical engineering students tested autonomous robots against invading zombies as one of many class competitions and design projects showcased at the U.'s Mechanical Engineering Design Day on Tuesday.

Other projects included a mechanical leech, an electronic device to help the visually impaired play soccer, racing vehicles and a lunar excavator.