Sanitation showcase | These six toilets could change the world. #WorldToiletDay | By Bill Gates | Back in 2011 we launched the Reinvent the Toilet Challenge. I want to tell you about
Bill Gates' Foundation Helped Invent $350 Toilets Powered by Worms
To Make A Point, Bill Gates Brings A Jar Of Human Poop To His Toilet Expo : Goats and Soda : NPR
Bill Gates' Foundation Helped Invent $350 Toilets Powered by Worms
Bill Gates aims to save half a million lives by reinventing the toilet
With poo on a pedestal, Bill Gates talks toilet technology | HeraldNet.com