Bill Gates: Build a better toilet

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Reinventing the Toliet
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Reinventing the Toliet
Kara Nelson, left, of the University of California at Berkeley, talks about the "pHree Loo" toliet, which is designed to safely disinfect sludge waste, as it sits on display 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)