The Toilet Revolution

Most of us take an “out of sight, out of mind” approach to waste and toilets, but Chelsea Wald is calling for a global toilet revolution. While toilets were quite the miracle back in the Victorian era, they flush away resources that could benefit us in many ways. Harvesting excreta could provide medical testing, disinfectants, fertilizers, and more. Guest: Chelsea Wald, award-winning science writer and author of "Pipe Dreams: The Urgent Global Quest to Transform the Toilet"