Heavy shipping containers like this one are used to transport molybdenum-99, a radioactive material used in diagnostic medical imaging. Courtesy of Lantheus Medical Imaging hide caption

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A Milestone: Retiring Rhode Island Rep. Patrick Kennedy (right) puts his arm around his successor, Providence Mayor David Cicilline, in Providence on Sunday. When Kennedy leaves office, it will be the first time in 60 years that a Kennedy will not hold elected office in the nation's capital. Gretchen Ertl/AP hide caption

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Sue Spencer, 50, stands with her daughter Gaelyn Spencer, 17, in front of their home in Marlborough, N.H. Erik Jacobs for NPR hide caption

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What does the future hold for I-95? One thing experts agree on is more traffic. Timothy Bell for NPR hide caption

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Pelicans rest on an oil retention boom near Grand Isle, La. Mario Tama/Getty Images hide caption

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Scott Burke, owner of Loop Linen and Uniform Service in Westwego, La., says the Gulf oil spill has had an impact on his bottom line. "As the restaurants slow down, we slow down," Burke says. "It's just a trickle-down effect." Tovia Smith/NPR hide caption

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