Here is a clip of Kamen (segway inventor) on the Colbert Repooor. Only 1/3 of the world's population has access to clean drinking water, and the leading cause of death in the world is dehydration due to intestinal diarrhea. This is a complicated read, but it turns out this guy really has invented a low cost, low energy water purifier. Villages in africa could create a cooperative and buy the purifier. Will cost about $1000 each.
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