Paul Rider runs on Mulholland Drive in Los Angeles, March 25, 2011. Researchers say a moderate running regimen is actually beneficial for the joints of people with healthy knees. Dennis J. Provost for NPR hide caption

toggle caption Dennis J. Provost for NPR
Put Those Shoes On: Running Won't Kill Your Knees
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How To Dress For Space Travel
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Richard Feynman Is The 'Quantum Man'
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How Do You Really Feel? Your Computer May Know
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Drilling To The Mantle Of The Earth
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Hunting For Traces Of America's First Inhabitants
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Did Ancient Eruptions Form Life's Building Blocks?
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Stone artifacts dating back 15,500 years suggest humans may have arrived 2,000 years earlier than previously thought. Courtesy of Michael R. Waters hide caption

toggle caption Courtesy of Michael R. Waters
Texas Find Turns Back Clock On Settlers In America
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Deception, Sex, Aeration: The Secret Life Of Orchids
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Camouflaging Red Blood Cells For Transfusion
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Update On Japan's Nuclear Reactors
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A fluorescence micrograph of HeLa cells, derived from cervical cancer cells taken from Henrietta Lacks and named in her honor Tomasz Szul/Visuals Unlimited, Inc./Getty Images hide caption

toggle caption Tomasz Szul/Visuals Unlimited, Inc./Getty Images
Tracing The 'Immortal' Cells Of Henrietta Lacks
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