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This satellite image taken Thursday shows the oil slick in the Gulf of Mexico as it nears the shoreline, threatening wildlife along Louisiana's fragile islands and barrier marshes. NASA/AP hide caption

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NASA/AP

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

Red and green aphids get their different colors by producing carotenoids, or color compounds. Courtesy of Charles Hedgcock, R.B.P. hide caption

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Courtesy of Charles Hedgcock, R.B.P.

This illustration shows the asteroid 24 Themis flanked by two small fragments that broke off following a crash more than 1 billion years ago. The bottom fragment's cometlike tail comes from the sublimation of ice from its surface. Gabriel Perez, Servicio MultiMedia, Instituto de Astrofisica de Canarias, Tenerife, Spain hide caption

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Gabriel Perez, Servicio MultiMedia, Instituto de Astrofisica de Canarias, Tenerife, Spain

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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Two ships float near the massive oil slick spreading in the Gulf of Mexico after a drilling rig sank last week off the coast of Louisiana. The slick is 80 miles long and 40 miles wide and growing. Brendan Farrington/AP hide caption

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Brendan Farrington/AP