A Visit To Antarctica

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Michael Ferrara with his German shepherd, Lhotse, at the top of Colorado's Independence Pass Paolo Marchesi/Outside hide caption

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First Responders, Rescuers Come Forward With PTSD

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Clay figurines discovered on the Mann Hopewell Site show faces with slanted eyes, which were not a Hopewell feature.  Some believe the figurines show a connection between Indiana and Central or South America. Indiana State Museum and Historic Sites hide caption

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The Prehistoric Treasure In The Fields Of Indiana

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A Lens On History: Advances in DNA technology have given scientists a new tool with which to study ancient human origins. "I think ancient DNA becomes very powerful" now, says one researcher, "because it gives you a direct look into the past." Here, a photographer shoots a reconstruction of a Neanderthal man at a museum in Germany. Sebastian Willnow/AFP/Getty Images hide caption

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2010: A Good Year For Neanderthals (And DNA)

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The hallucinogenic mushroom Amanita muscaria. Harvard biologist Donald Pfister claims that both people and reindeer ate the mushrooms. "Reindeers flying -- are they flying, or are your senses telling you they're flying because you're hallucinating?" he says. John Tann/flickr hide caption

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Did 'Shrooms Send Santa And His Reindeer Flying?

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This tooth, which was also found in Denisova Cave, has a DNA structure similar to that of a finger bone. Its shape and physical structure are, however, very different from that of Neanderthals and modern humans, leading researchers to believe that the Denisovans are a distinct group. David Reich, et al./Nature hide caption

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Ancient Bone's DNA Suggests New Human Ancestors

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Wild Chimps, Stick Dolls: What's At Play Here?

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Visions Of Energy Efficiency Danced In Their Heads

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Living Without Fear

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Researchers have built a database of more than 500 billion words, culled from a collection of 5 million books. Parsing the words provides a unique insight into cultural changes, they say. Justin Sullivan/Getty Images hide caption

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Google Book Tool Tracks Cultural Change With Words

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