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2009 Solar Decathlon | by Dept of Energy Solar Decathlon
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2009 Solar Decathlon

Student Arnaldo Vazquez from the Universidad de Puerto Rico cleans solar panels at night to maximize energy efficiency during the U.S. Department of Energy Solar Decathlon on the National Mall in Washington, D.C., Saturday, Oct. 10, 2009. (Photo by Stefano Paltera/US Dept. of Energy Solar Decathlon)

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Taken on October 10, 2009