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Caltech's 28th Annual ME72 Engineering Design Contest

Team Blacker Air and Machinery Force's quad chopper flies through the air with a hanging battery during the 28th Annual ME72 Engineering Design Contest - Sponge Wars: Attack of the Drones, at Caltech in Pasadena on Tuesday, March 12, 2013. Although somewhat crippled during flight, the quad... Raul Roa/Staff Photographer
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