The average person uses a toilet 2,500 times a year and spends three years of his or her life on the toilet. That's pretty startling when you consider that 2.6 billion people on the planet have little or no access to sanitary toilets. If there is one thing I can't stand, it's a filthy public restroom--you've heard the phrase, you can tell the state of a restaurant by judging the state of its restrooms. A place with empty soap dispensers or toilet paper scattered all over the floor or overflowing trash cans is not likely to provide an edible meal. But that's not the kind of dirty restroom I'm talking about. I'm talking about toilets so unsanitary you wouldn't let your cows use them. I'm talking about toilets so dysfunctional, the waste empties untreated directly into the environment. I'm talking about such unsanitary conditions that 2 million people die every year from diarrheal diseases, diseases that could be prevented with the accessibility of ...