Bill Gates, former Microsoft CEO and co-founder of the Bill and Melinda Gates Foundation, gestures to a jar of human feces as he speaks at the Reinvented Toilet Expo in Beijing, Tuesday, Nov. 6, 2018. With a jar of human feces on a podium next to him, billionaire philanthropist Bill Gates has kicked off a "Reinvented Toilet" Expo in China. Gates said Tuesday that the technologies on display at the three-day expo in Beijing represent the most significant advances in sanitation in nearly 200 years. (AP Photo/Mark Schiefelbein)
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