Zeffy Ruvalcaba, a civil engineer with the U.S. Army Corps of Engineers Sacramento District, offers constructive feedback on a lemon-powered iPod charger during Folsom High School's seventh-annual Engineering Challenge April 11, 2014, in Folsom, Calif. Student projects included: hovercrafts, catapults, Tesla coils, electromagnetic propulsion devices, pneumatic wind turbines, voice synthesizers, hydrogen fuel cells, solar electric boats and cars, gene transformation, and orthopedic implants. (U.S. Army photo by Todd Plain/Released)
May 2, 2014
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