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Sir David Attenborough at the Beijing Museum of Natural History with fossil of Juramaia, as featured in the Smithsonian Channel series Rise of Animals: Triumph of the Vertebrates. Courtesy Smithsonian Channel hide caption

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Hudson River view. Brian Mann/North Country Public Radio hide caption

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Landmark Conservation Deal Offers A First Glimpse Of New Wilderness


Once closed to the public, adventure seekers can now explore a wild stretch of New York state's Hudson and Opalescent Rivers.

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A view of Seattle from the Bullitt Center. Brad Kahn/Flickr hide caption

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13.7: Cosmos And Culture

Is Civilization Natural?

Commentator Adam Frank says if we're building cities that affect the entire planet, maybe it's time to start thinking about how nature and cities can evolve together.

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All of our scientific tools have limits. These limits ensure that we will never see the whole picture. We can never have complete knowledge of the universe. Above, the ESO's APEX radio telescope probes the heavens from its lonely perch on Chile's Chajnantor plateau. Gordon Gillet/ESO hide caption

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Will the distant future give rise to exhibits of a human past long gone, much as we gawk today at representations of a dinosaur age we can only imagine? Aamir Qureshi/AFP/Getty Images hide caption

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