The roof of the new $182.6 million National Children's Museum outside Washington, D.C., will include a sun reflector to reduce the amount of artificial light needed in the building. The 150,000-square-foot museum's design also includes a wind turbine and a green wall to shade the building from the sun. The four-story, LEED-certified structure will be built of recycled and sustainable materials. It will open in 2013 in Oxon Hill, Md.

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