The Peepoo Bag: A Biodegradable, Single-use Toilet

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Anders Wilhelmson, a Swedish architect, professor, and entrepreneur, has developed this thing called the Peepoo bag. It's a single-use toilet for slums in the developing world where there aren't permanent facilities. From The New York Times:

Once used, the bag can be knotted and buried, and a layer of urea crystals breaks down the waste into fertilizer, killing off disease-producing pathogens found in feces.

This is a great invention. Not only does this bag give people a more sanitary way of dealing with their waste, it also reduces plastic trash and provides some fertilizer. It may seem a little gross, but in slums the alternatives are often much grosser. Wilhelmson plans to sell these for 2 to 3 cents each. I imagine the challenge will be getting them distributed.