Researchers raised two groups of walking, air-breathing Polypterus senegalus — one on land and one on the water. They discovered that each group was able to adapt to be best suited to its environment. A. Morin, E.M. Standen, T.Y. Du, H. Larsson/McGill University hide caption

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A technician tests samples from Ebola-infected patients at a field lab, run by Doctors Without Borders, in Kailahun, Sierra Leone. Tommy Trenchard for NPR hide caption

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Ebola Is Rapidly Mutating As It Spreads Across West Africa

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The granulated surface of the lake bed known as the Racetrack is a favorite destination for tourists — and for scientists who want to investigate trails left by the meandering stones. Momatiuk - Eastcott/Corbis hide caption

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An Icy Solution To The Mystery Of The Slithering Stones

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An earlier spring in Montana's Glacier National Park means full waterfalls at first — but much drier summers. Robert Glusic/Corbis hide caption

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There's A Big Leak In America's Water Tower

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Parking Behavior May Reflect Economic Drive

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Pew Study: Facebook, Twitter Users Held Back Views On Snowden

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A scientist tests a patient's blood for Ebola at the European Mobile Laboratory in Gueckedou, Guinea. The first cases reported in the outbreak occurred in a small village about eight miles outside Gueckedou. Misha Hussain /Reuters /Landov hide caption

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Could A 2-Year-Old Boy Be 'Patient Zero' For The Ebola Outbreak?

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Drug Offers Hope For Those With Alopecia Areata

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New Camouflage Material Is A Color-Change Artist

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Antarctic Lakes, Rivers, Wetlands — All Under A Kilometer Of Ice

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Why Civil Resistance Movements Succeed

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