Environment

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Palmetto trees, the state tree of South Carolina, frame a gas station sign on Folly Beach, S.C., on Monday, May 21, 2012. The Carolinas AAA motor club reported that South Carolina had the cheapest gas in the nation on Monday and prices could drop even more this summer. (AP Photo/Bruce Smith)

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Axis deer are plentiful on the island of Maui in Hawaii, where they have caused considerable damage over the years to the landscape, but now there are an estimated 100 on the Big Island, 30 miles away, and no one knows how they got there. (Forest and Kim Starr via Associated Press)

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Once touted as the "Eighth Wonder of the World," the Astrodome gathers dust on Monday, May 21, 2012, in Houston. (AP Photo/Pat Sullivan)

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Renee Denton, director for medical oncology and pediatrics at Freeman Hospital, releases a lantern Tuesday, May 22, 2012 during Morning Has Broken event at Freeman Hospital. The laterns were in remembrance of the May 22, 2011 tornado victims. The tornado killed 161 people and destroyed one-third of the city, making it the nation's deadliest single tornado in six decades. (AP Photo/The Joplin Globe, Roger Nomer)

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People walk along the path of destruction on the anniversary of a deadly tornado. (AP Photo/Charlie Riedel)

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People walk along the path of destruction on the anniversary of a deadly tornado that devastated Joplin, Mo. (AP Photo/Charlie Riedel)

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People walk past a memorial to tornado victims who died in a nursing home along path of destruction on the anniversary of a deadly tornado that devastated the area a year ago. (AP Photo/Charlie Riedel)

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Thousands of people walk the path of destruction of last year's deadly tornado. The community is marking the anniversary of the EF-5 tornado that killed 161 people as it cut a wide swath through Joplin a year ago. (AP Photo/Charlie Riedel)

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Volunteers work on a Habitat for Humanity home. The community is marking the anniversary of a deadly tornado that killed 161 people as it cut a wide swath through Joplin a year ago. (AP Photo/Charlie Riedel)

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Marilyn Sixx hugs her son, Chris Sixx, during a ceremony marking the anniversary of a deadly tornado that devastated Joplin, Mo., a year ago. (AP Photo/Charlie Riedel)

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The Falcon 9 rocket cut a fiery arc through the darkness when it lifted off just before 4 a.m. Tuesday and boosted an unmanned capsule into orbit. Financed by a billionaire businessman, the ship will deliver supplies to the International Space Station. The launch marked the first time a commercial spacecraft has been sent to the outpost. (Associated Press)

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Duke goalie Dan Wigrizer has a .600 save percentage in two NCAA tournament games heading into Saturday's semifinal against Maryland. (Duke University)