After heavy rain, the sun strikes the bifacial solar panels at Appalachian State University's entry in the U.S. Department of Energy Solar Decathlon 2011 at West Potomac Park in Washington, D.C., Wed., Sept. 28, 2011. (Credit: Stefano Paltera/U.S. Department of Energy Solar Decathlon)
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dvgene 5 weeks ago | reply
A2FP