An exhibitor demonstrates the use of a toilet tap where water is recycled and reused, during Reinvent The Toilet Fair in New Delhi, India. Scientists who
An exhibitor demonstrates the use of a toilet tap where water is recycled and reused, during Reinvent The Toilet Fair in New Delhi, India. Scientists who accepted the Bill & Melinda Gates Foundationâ s challenge to reinvent the toilet showcased their inventions in the Indian capital Saturday with the primary goal to sanitize waste, use minimal water or electricity, and produce a usable product at low cost. (Tsering Topgyal/AP Photo)