Andy Nguyen, 10, and Garry Zeng, 10, of Rose Elementary School's 4th through 6th grade GATE class adjust elastic bands on their catapult, which will be used during the San Jose Tech Museum's Tech Challenge, as Andy Vu, 11, watches during the MUSD Student Technology Showcase at Milpitas High School in Milpitas, California, on March 2, 2013. (Stan Olszewski/SOSKIphoto)
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