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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Just before he snorted ... Jerilee Wei hide caption

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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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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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