This self-portrait of NASA's Mars rover Curiosity combines dozens of exposures taken by the rover's Mars Hand Lens Imager during the 177th Martian day, or sol, of Curiosity's work on Mars, plus three exposures taken during Sol 270 to update the appearance of part of the ground beside the rover. NASA/JPL-Caltech/MSSS hide caption

toggle caption NASA/JPL-Caltech/MSSS

Wood fibers are coated with carbon nanotubes and then packed into small disks of metal. The sodium ions moving around in the wood fibers create an electric current. Heather Rousseau/NPR hide caption

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Before And After: These near-infrared images of Uranus show the planet as seen without adaptive optics (left) and with the technology turned on (right). Courtesy of Heidi B. Hammel and Imke de Pater hide caption

toggle caption Courtesy of Heidi B. Hammel and Imke de Pater

The small patch in the middle of the image is Aulacomnium turgidum, a type of bryophyte plant. Researchers in the Canadian Arctic say they are surprised the bryophytes were still green, even after being covered by ice. Courtesy of Caroline La Farge hide caption

toggle caption Courtesy of Caroline La Farge

The Two-Way

Beneath A Glacier's White, Researchers See Green

Underneath a receding glacier in the Canadian Arctic, researchers found something surprising: a kind of plant related to moss that was not only still green, but also growing.

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