Environment

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** FILE ** American technology, along with its geology, has allowed oil and gas to be extracted from shale deposits deep within the bedrock. (Associated Press)

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**FILE** Capitals defenseman Steve Oleksy played three seasons at Lake Superior State (Lake Superior State University)

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**FILE** Capitals defenseman Steve Oleksy played three seasons at Lake Superior State (Lake Superior State University)

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**FILE** Capitals defenseman Steve Oleksy played three seasons at Lake Superior State (Lake Superior State University)

Mohammed Sohel Rana (center), the fugitive owner of an illegally constructed building that collapsed last week in Bangladesh, reacts as he is produced before the media in Dhaka, Bangladesh, the capital, on Sunday, April 28, 2013. Mr. Rana was arrested near the border in Benapole, in western Bangladesh, just as he was about to flee into India's West Bengal state, said Jahangir Kabir Nanak, junior minister for local government. (AP Photo/Palash Khan)

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A Bangladeshi garment worker who soldiers said was pulled alive from the rubble reacts as he walk on his own at the site of a building that collapsed Wednesday in Savar, near Dhaka, Bangladesh, Friday, April 26, 2013. By Friday, the death toll reached hundreds of people as rescuers continued to search for injured and missing.(Associated Press)

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Chinese soldiers unload relief supplies from a helicopter in quake-ravaged Sichuan province. Saturday's 7.0-magnitude earthquake killed at least 186 and injured thousands. The military is in full control of relief and rescue, with citizen-initiated efforts to help strictly banned.

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A public art project created as part of the MuralsDC program outside Dance Place in Northeast D.C. (Photo courtesy MuralsDC)

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A pond that was dry during last year's drought is full again near Sprague, Neb., on Thursday, April 25, 2013. Farmers who have spent the past several months staring at parched fields have a new problem: mud. A rainy spring has brought weeks of rains to the middle of the country, and while it hasn't completely ended the historic drought, new forecasts show it surely has helped. (AP Photo/Nati Harnik)

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Former president George W. Bush and his wife, Laura, arrive April 25, 2013, at the dedication of the George W. Bush Presidential Center in Dallas. (Associated Press)

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An electron microscope image provided by the Centers for Disease Control and Prevention shows the H7N9 virus which can take on a variety of shapes, April 15, 2013. Almost three weeks after China reported finding a new strain of bird flu in humans, experts are still stumped by how people are becoming infected when many appear to have had no recent contact with live fowl and the virus isn't supposed to pass from person to person. (Associated Press)