In much of the world, the housing crisis is not about bank foreclosures and falling prices. It's about having any kind of house at all. As cities continue to grow in developing countries, so do the sprawling slums where many people survive in makeshift shelters. In South Africa, an architect and a builder have come up with an innovative housing solution. They're constructing affordable homes out of sand. We sent reporter Terry Fitzpatrick to take a look.
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