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The toilet is a necessary convenience which many of us use without much thought. But when nature calls, not everyone has the luxury to use a toilet that is clean and safe. What is the world's richest man Bill Gates doing to address this issue? Is the toilet as we know it now, near-perfect design? Can it ever be replaced? What will the new toilets look like? What opportunities can the sanitation economy bring in the future? And most importantly, why is reinventing and innovating the toilet not a one-size-fits-all solution'? Read on to find out...