Bill Gates competition aims to flush out the best ideas in toilet technology

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Ted S. Warren

Reinventing the Toliet

Marcos Fiovavanti, of the Ecuador-based "Fundacion In Terris" group, talks about the "Earth Auger Toliet," which is operated by a mechanical pedal and chain system, 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)

Ted S. Warren

Bill Gates

Bill Gates, right, looks at a device that uses solar energy to treat human waste, as he tours 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)

Ted S. Warren

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)