American surfer Garrett "GMAC" McNamara rides what could be, if confirmed, the biggest wave conquered in history as a crowd watches Monday in Nazare, Portugal. To Mane/Barcroft Media /Landov hide caption

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Twins in Malawi helped scientists discover a role the gut microbiome appears to play in severe malnutrition. Photograph courtesy of Tanya Yatsunenko hide caption

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Gut Microbes May Play Deadly Role In Malnutrition

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International ships call at the busy Port of New Orleans. It's a major shipping convergence point on the Mississippi River. Ships come upriver from the Gulf of Mexico with imports from abroad, and barges come downriver, bringing U.S. goods for export. Debbie Elliott/NPR hide caption

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Drought Causes Ripple Effect Along Mighty Mississippi River

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Highly detailed sonar systems aboard the research vessel Pritchard gave researchers a clear view of the sediment on the seafloor off Long Island. Courtesy of John Goff/University Of Texas hide caption

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Sand After Sandy: Scientists Map Seafloor For Sediment

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Out For Lunch? Researchers estimate that billions of birds and small mammals are killed by cats in the U.S. annually. Vishnevskiy Vasiliy/iStockphoto hide caption

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Killer Kitties? Cats Kill Billions Of Creatures Every Year

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Scientists Discover Dung Beetles Use The Milky Way For GPS

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The eye of Hurricane Earl in the Atlantic Ocean, seen from a NASA research aircraft on Aug. 30, 2010. This flight through the eyewall caught Earl just as it was intensifying from a Category 2 to a Category 4 hurricane. Researchers collected air samples on this flight from about 30,000 feet over both land and sea and close to 100 different species of bacteria. Jane Peterson/NASA hide caption

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Bird, Plane, Bacteria? Microbes Thrive In Storm Clouds

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Cows graze in front of the Rosengarten mountain massif in northern Italy. Pasture grazing is practiced throughout the Alps. Matthias Schrader/Associated Press hide caption

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Federal Agency Funds New Energy Technologies

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Opponents of fracking demonstrate during the Winter X Games 2012 in Aspen, Colo. Doug Pensinger/Getty Images hide caption

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Focus On Fracking Diverts Attention From Horizontal Drilling

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In Arizona, Some Retirees Caught In Never-Ending Battle With Invasive Species

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