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In this Friday, March 21, 2014 photo, an exhibitor displays a Biochar, a charcoal-like product made from human waste, used as cooking fuel or fertilizer, at the Reinvent The Toilet Fair in New Delhi, India. Scientists who accepted the Bill & Melinda Gates Foundation’s challenge to reinvent the toilet showcased their inventions in the Indian capital Saturday. The primary goal: to sanitize waste, use minimal water or electricity, and produce a usable product at low cost. India is by far the worst culprit, with more than 640 million people defecating in the open and producing a stunning 72,000 tons of human waste each day - the equivalent weight of almost 10 Eiffel Towers or 1,800 humpback whales. (AP Photo/Tsering Topgyal)
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In this Friday, March 21, 2014 photo, 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 Foundation’s challenge to reinvent the toilet showcased their inventions in the Indian capital Saturday. The primary goal: to sanitize waste, use minimal water or electricity, and produce a usable product at low cost. India is by far the worst culprit, with more than 640 million people defecating in the open and producing a stunning 72,000 tons of human waste each day - the equivalent weight of almost 10 Eiffel Towers or 1,800 humpback whales. (AP Photo/Tsering Topgyal)
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In this Friday, March 21, 2014 photo, an exhibitor from Loughborough University demonstrates the use of a toilet during Reinvent The Toilet Fair in New Delhi, India. Scientists who accepted the Bill & Melinda Gates Foundation’s challenge to reinvent the toilet showcased their inventions in the Indian capital Saturday. The primary goal: to sanitize waste, use minimal water or electricity, and produce a usable product at low cost. India is by far the worst culprit, with more than 640 million people defecating in the open and producing a stunning 72,000 tons of human waste each day - the equivalent weight of almost 10 Eiffel Towers or 1,800 humpback whales. (AP Photo/Tsering Topgyal)
