The Deepwater Horizon oil rig burns in the Gulf of Mexico in April 2010. The rig's crew were new to their positions just before the explosion. Such staffing reorganizations are increasingly common as the industry grapples with a staffing shortage. U.S. Coast Guard/Getty Images hide caption

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In a video from the Horatio Alger Association, William Doré tells of a tense and abusive childhood. Horatio Alger Association/YouTube hide caption

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A driver pumps gas in Los Angeles, where prices are among the highest in the country, topping $4 a gallon. Frederic J. Brown/AFP/Getty Images hide caption

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A 1974 Gremlin covered with Mardi Gras beads is part of the auction lot of items from the former Kenner Mardi Gras Museum. The car is expected to draw several bids. Jeff Brady/NPR hide caption

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A Shell-owned ethylene cracker plant on Pulau Bukom, Singapore. Several U.S. states are competing for a similar plant the company plans to build in northern Appalachia. Courtesy of Shell Chemicals hide caption

itoggle caption Courtesy of Shell Chemicals

The town of Nitro has its beginnings in 1917, when the U.S. government created it as a place to locate a munitions plant. Jeff Brady/NPR hide caption

itoggle caption Jeff Brady/NPR

A woman pays her respects at a statue of Joe Paterno outside Beaver Stadium on the Penn State University campus in State College, Pa., after learning of his death on Sunday. Gene J. Puskar/AP hide caption

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The Syncrude tar sands mine in Alberta, Canada. Alberta's tar sands would supply the oil for the prospective Keystone XL pipeline. Todd Korol/Reuters/Landov hide caption

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The Syncrude tar sands mine north of Fort McMurray, Alberta, is seen in November. Alberta's tar sands would supply the oil for the prospective Keystone XL pipeline. Todd Korol/Reuters/Landov hide caption

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Rick Santorum receives a call at his campaign headquarters during his Senate re-election bid in 2006. The former senator was attempting to keep his Pennsylvania Senate seat, which he later lost to Democrat Bob Casey Jr. Jeff Swensen/Getty Images hide caption

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