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"A passive solar home in Japan boasts various energy-saving features and a sloping, stair-clad roof that doubles as hangout area/lounge for (hopefully well-behav"^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.mnn.com/your-home/remodeling-design/blogs/an-eco-home-with-one-serious-staircase>