The sanitation revolution has done more to save lives and improve health than any public health intervention in the past 200 years. But the flush toilet has only reached one-third of the world’s population. Clearly, we need to encourage new ideas and new approaches to accelerate safe and affordable access to sanitation for everyone. — gatesfoundation.org

Sanergy, a year-old for-profit social enterprise that manufactures high-quality, yet low-cost and compact toilets for urban slums in the developing world and then uses human waste to produce energy and fertilizer. It is an “affordable, accessible and hygienic sanitation” solution for millions that live in places without sewage or electricity. They are places where the street is the bathroom. And that’s precisely the problem. — blogs.forbes.com