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Some of the worms and germs we've been warding off may actually keep us well. One solution, some scientists say, is to welcome them back
I met William Parker just two days before World Toilet Day, an international campaign to break taboos about, yes, potties. It's a subject not many like to talk about. The cause is a critical one: access to sanitation and safe drinking water are key to preventing a host of diseases. But a growing body of research suggests there may be a dark side to clean living.
