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

Students Lutz Steiner, left, and Henning Zimmer of Team Germany, sets the last solar panel on their team's house during the 2009 U.S. Department of Energy Solar Decathlon on the National Mall in Washington, D.C., Monday, Oct. 05, 2009. (Photo by Stefano Paltera/US Dept. of Energy Solar Decathlon)

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Taken on October 5, 2009