A crash course in changing the world.
From TED: Too much of the world lacks access to clean drinking water. Engineer Michael Pritchard did something about it -- inventing the portable Lifesaver filter, which can make the most revolting water drinkable in seconds. An amazing demo from TEDGlobal 2009.
http://www.ted.com/talks/michael_pritchard_invents_a_water_filter.html
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