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Informal education intern Mia Nilo, a biology major at San Diego State University, explains the Green Tech Airfield exhibit at the AERO Institute in Palmdale, Calif., to visitors during the Thursday Night on the Square activity in the Palmdale Civic Center. In line with NASA’s Earth Science / Green Tech theme, the exhibit features a model train powered by solar cells, models of solar arrays on carports and hangar roofs, models of wind turbines, and a hands-on pinwheel craft activity for children to illustrate wind turbines. (NASA photo / Cecilia Cordova)