Current water-filtering technology is costly, but MIT scientists are testing a simpler and cheaper method that uses wood from white pine trees. Wikimedia Commons hide caption

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Wikimedia Commons

To Clean Drinking Water, All You Need Is A Stick

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Scientists published the first global survey of the known undersea freshwater reserves. Water is relatively cheap now, but the reserves could be valuable if it becomes scarcer in the future. Olivier Morin/AFP/Getty Images hide caption

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Olivier Morin/AFP/Getty Images

Demonstrator China Starshine holds up signs outside of City Hall in Portland last week. Ross William Hamilton/The Oregonian/AP hide caption

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Ross William Hamilton/The Oregonian/AP

Portland, Ore., Becomes Latest Fluoride Battleground

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