How Cities Save Water

L.A.’s use of floating shade balls (above), which block the sun over reservoirs to prevent evaporation, is just one of many inventive new methods being tapped...

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Photo Essays

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Top 10 Sun Myths

NASA's new 360-degree image of the sun is a stunning look at the star that gives us all life. But for centuries, we had wild beliefs about the sun and how it got...

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