Water plant operator Torrey Jones checks the clarity of a sample of treated water at the Beaver Falls Municipal Authority water treatment plant in Beaver Falls, Pa. Keith Srakocic/AP hide caption

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Peanut butter prices are up — and likely to increase again. Edward Todd/iStockphoto.com hide caption

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Ben Shaw hangs from an oil derrick outside Williston, ND, in July 2011. Williston's mayor, Ward Koeser, estimates that the town has between 2,000 and 3,000 job openings for oil workers. Gregory Bull/AP hide caption

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U.S. Air Force F-16 jet fighters sit on the tarmac at Aviano Air Base in Italy in March. The Air Force tested its jets on fuel made of 50 percent vegetable oil. Giuseppe Cacace/AFP/Getty Images hide caption

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