"People 4,500 years ago managed to keep their homes appropriately warm and cool without high technology -- and without wasting energy. How did they do it? "Traditional courtyard homes developed between 3,000 or 2,000 BC "incorporate a variety of appropriately designed inward-looking habitable rooms and spaces at different floor levels around a planted courtyard to suit different seasons and to enhance privacy," according to an exhibit at the Science Museum of London that shows a model of one such house in Baghdad. These "naturally conditioned homes" are still found in many places, from Beijing to southeast Turkey, and likely beyond..."

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