Republican presidential candidate Mitt Romney participates in a 6th-grade language arts class with Salina Beattie and other students at Universal Bluford Charter School on Thursday in Philadelphia. Mario Tama/Getty Images hide caption

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The U.S. oil boom has created a glut of crude in Cushing, Okla., a major oil storage hub. This sign dubs the city the "Pipeline Crossroads of the World." Jeff Brady/NPR hide caption

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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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The GasBuddy app and website rely on crowdsourcing — people across the country sending in gas prices. NPR 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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