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Published August 14, 2012, 12:00 AM

Bill Gates looks at a device that uses solar energy


Bill Gates, right, looks at a device that uses solar energy to treat human waste as he tours the "Reinventing the Toliet" Fair on Tuesday 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)
Read the article: Bill Gates' foundation seeking new toilet technology