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, uses simulated human waste to demonstrate their concept for a better seal for latrines typically used in South Asian countries, 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)