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Stephen Quake (left) and Euan Ashley review genetic risk factors that Ashley and colleagues found in Quake's genome. Norbert von der Groeben/Stanford School of Medicine hide caption

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Norbert von der Groeben/Stanford School of Medicine

Just before he snorted ... Jerilee Wei hide caption

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Jerilee Wei

How Exercise Might Help Keep Alzheimer's At Bay

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Smog covers downtown Los Angeles on Wednesday. A new report finds that the Los Angeles area had the worst levels of ozone, based on figures from 2006-2008. Nick Ut/AP hide caption

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Nick Ut/AP

Spinal Muscular Atrophy 'Doesn't Define Me'

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Mike Kasavich, a lifelong coal miner, exits "the hole" after a 10-hour morning shift at the Mathies coal mine in western Pennsylvania. Black lung disease is increasing among miners, yet they are struggling to get disability reimbursement for the illness. Spencer Platt/Getty Images hide caption

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Spencer Platt/Getty Images