Can Gates do for the toilet what he did for the computer?

Bill Gates is not a squeamish man. He also has an abiding faith in technology. And so it is that the former head of Microsoft Corp., now co-chair of the Bill & Melinda Gates Foundation, has turned his attention to the reinvention of the toilet. As Gates knows, two-thirds of the world's people have no access to that great leap in sanitation, credited with adding a decade...

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