This abalone shell was found with ocher and a grinding stone. The iron oxide was used as a pigment to paint bodies and walls, as well as to thicken glue.

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In African Cave, An Early Human Paint Shop

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Inside Namibia's Rural Communal Conservancies

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Spooked by a noise, giraffes in northwest Namibia interrupt lunch to look around. John W. Poole/NPR hide caption

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To Save Wildlife, Namibia's Farmers Take Control

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Using Twitter To Tap Into The Mood Of The Planet

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Cattle and zebra share a meal in a pasture in Kenya. Ryan Lee Sensenig/Science hide caption

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Zebra And Cattle Make Good Lunch Partners, Researchers Say

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The Quay Brothers, filming Through The Weeping Glass at the Mutter Museum in Philadelphia. The Quays started filming without a script or a storyline. Edward Waisnis/Behind the Scenes with the Quay Brothers hide caption

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Quays Focus 'Weeping Glass' On The Mutter Museum

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EPA Postpones Power Plant Emissions Rules

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When the T. rex skeleton was first put on display, it was presented standing vertically, in this Godzilla-like pose, as seen at the Carnegie Museum of Natural History around 1950. Recent studies show the dinosaur actually kept its body horizontal. Watch the videos here to see how T. rex walked. Carnegie Museum of Natural History hide caption

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Bone To Pick: First T. Rex Skeleton, Complete At Last

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The fossil of Australopithecus sediba could be the long-sought transition between ape-like ancestors and the first humans. "It shows a small brain, but a brain that's beginning to reorganize in some ways that resemble our brain," says anthropologist Lee Berger. Brett Eloff via Lee Berger/University of Witwatersrand hide caption

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'Mosaic' Fossil Could Be Bridge From Apes To Humans

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An artist's reconstruction of the Tibetan woolly rhino. Woolly rhinos used their flattened horns to sweep snow off of vegetation, a critical adaptation to survive frigid conditions. Image by Julie Naylor hide caption

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An Ice Age Beast Evolved To Beat The Cold

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Two women check their cellphones as they hawk their wares on a bridge over the Artibonite River, whose waters are believed to be the source of Haiti's 2010 cholera outbreak. Nicholas Kamm/AFP/Getty Images hide caption

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Cellphones Could Help Doctors Stay Ahead Of An Epidemic

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A Libyan oil worker at a refinery inside the Brega oil complex, in eastern Libya, on Feb. 26. Production at Brega has dropped by almost 90 percent amid the country's crisis because many employees have fled, and few ships are coming to the port. Hussein Malla/AP hide caption

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Restarting Libya's Valuable Oil Exports Won't Be Easy

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Rare Earthquake Rocks Eastern Seaboard

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