The Solar Bio-Char toilet is being developed at the University of Colorado in Boulder. Solar power is used to generate very high temperatures, which turn waste into a sanitary charcoal. It's like my beloved Cinderella, except it uses the sun rather than electricity.
Given sanitation issues in much of the third world (more people have a cell phone than have access to a sanitary toilet), a self-contained system such as this could make a significant improvement in public health for many millions of people.
Boulder is a good place for such a project, as it is one of the sunniest places in the US. (It's also Sooz's alma mater!)
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