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10 Innovations in Water Purification

science.howstuffworks.com/environmental/green-tech/sustainable/10-innovations-water-purification.htm

As far back as 1500 B.C.E., people were trying to purify water to make it drinkable. And we're still at it. Today inventors use tools as simple as clay and as sophisticated as carbon nanotubes to bring clean water to the world.