Workers walk inside the LyondellBasell oil refinery in Houston in 2013. Lower oil prices are stoking fears of an economic decline in the region. Donna Carson/Reuters/Corbis hide caption

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Lincoln has invested hundreds of millions of dollars in revitalizing its downtown, a historic area called Haymarket, to create a more culturally vibrant urban center that is helping the city keep and attract young adults. David Schaper/NPR hide caption

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Jorge Cham is the creator of PHD Comics and received his doctorate in mechanical engineering at Stanford University. PHD (Piled Higher and Deeper) is a comic strip about life (or the lack thereof) in academia. See more of his work at www.phdcomics.com. Jorge Cham/PHD Comics hide caption

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Jeroen Dijsselbloem, the head of the Eurogroup (right) sits next to Roberto Gualtieri, the chairman of the Committee on Economic and Monetary Affairs, during a meeting Tuesday at the European Parliament in Brussels. The European Union's executive branch said the list of Greek reform measures for final approval of the extended rescue loans is sufficiently comprehensive to be a valid starting point. Geert Vanden Wijngaert/AP hide caption

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A truck drives on top of a levee that protects a soybean field in New Madrid County, Mo., when the Mississippi River floods. Kristofor Husted/KBIA hide caption

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Drilling rigs dot the landscape near Calumet, Okla., in April 2013. Oklahoma's economy blossomed during the domestic fracking boom, but as the price of crude oil drops, that could change. Sue Ogrocki/AP hide caption

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Quinault Indian Nation President Fawn Sharp stands on the docks as tribal crabbers unload their catch. The tribe has vowed to fight the oil train-to-ship terminals proposed for Grays Harbor. Ashley Ahearn/KUOW hide caption

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