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Watch Bill Gates drink water made from human waste
Since stepping down as Microsoft CEO, Bill Gates has been hard at work trying to tackle the world's biggest health problems. One promising project that's caught his eye is the Omniprocessor, a huge machine that converts sewer sludge (yes, that means human waste) into clean drinking water, ash and electricity. Of course, Gates was keen to visit one of the facilities to see, and more importantly taste, the results for himself.
