Customers try out cellphones and tablets in a store in Tehran, in 2012. Financial sanctions make it difficult for U.S. firms to do business in Iran, analysts say. Vahid Salemi/AP hide caption

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A shortage of lifeguards across U.S. cities could be a fallout of the recovering economy. Christopher Corr/Ikon Images/Getty Images hide caption

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Thai and Burmese fishing boat workers sit inside a cell at the compound of a fishing company in Benjina, Indonesia on Nov. 22, 2014. The imprisoned men were considered slaves who might run away. Dita Alangkara/AP hide caption

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Comedian Ari Shaffir performs at the 2015 Bonnaroo Music and Arts Festival in June in Manchester, Tenn. Shaffir has said fellow comedian Carlos Mencia stole his joke about who would build a fence on the U.S.-Mexican border. Copyright on jokes is difficult to prove, and it turned out two other comedians had made similar jokes as well. John Davisson/Invision/AP hide caption

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A Chinese worker is seen at a construction site in Beijing. Economic changes in China and in other places have reduced demand and prices for commodities like the metal in the building's structure. AP hide caption

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Eliot Elementary in St. Louis, Mo., closed 10 years ago. The building remains empty. Tim Lloyd/ St. Louis Public Radio hide caption

itoggle caption Tim Lloyd/ St. Louis Public Radio