Bill Gates: Build a better toilet

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Reinventing the Toliet
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Reinventing the Toliet
James McHale, vice president of engineering for American Standard Brands, demonstrates how their concept of a better seal for latrines typically used in South Asian countries can be "flushed" with only one liter of water, at the "Reinventing the Toliet" Fair, Tuesday, Aug. 14, 2012, in Seattle, which is part of a Bill & Melinda Gates Foundation competition to reinvent the toilet for the 2.6 billion people around the world who don't have access to modern sanitation. (AP Photo/Ted S. Warren)