XMRV, a mouse virus, may be an artifact of laboratory experiments rather than the cause of chronic fatigue syndrome. Whittemore Peterson Institute hide caption

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Energy, Sports Drinks Aren't So Healthy For Kids

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A study published in the journal Science last December suggested that a bacterium found in California's Mono Lake was able to substitute arsenic for phosphorous. But that conclusion has many critics. Miss Bliss 55 via Flickr hide caption

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Study Of Arsenic-Eating Microbe Finds Doubters

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Examining The Hummingbird Tongue

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The Moon May Be Wetter Than We Thought

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Are Math Skills Built In To The Human Brain?

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Microbes Hitchhiking On Hailstones

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Species Institute Announces Top 10 Discoveries

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Shoppers crowd a narrow street outside Tsukiji market in Tokyo on Dec. 31, 2010. Japan has relatively tight social rules. And that makes sense, according to researchers. When people are squeezed together, they have an incentive to cooperate. Toru Yamanaka/AFP/Getty Images hide caption

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Of War And Kisses: How Adversity Shapes Culture

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Mixing antidepressant Paxil and the cholesterol-fighter Pravachol may lead to an unexpected increase in blood sugar, researchers say. Joe Raedle/Getty Images hide caption

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What Shape Are Electrons? Scientists Try To Find Out

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Henrietta Lacks Receives Honorary Degree

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Exoplanets Floating Freely, Without A Star

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NASA's Dawn Spacecraft Closes In On Its Target

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CT scans of fossil Hadrocodium skulls allowed scientists to reconstruct its brain. The olfactory bulbs, located at the front of the brain, grew steadily larger as millions of years passed. Matt Colbert/University of Texas at Austin hide caption

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Mammals Smelled Their Way To Bigger Brains

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