Across Washington State, hydroelectric dams are blocking salmon as they migrate to their spawning grounds. Enter the salmon cannon. Ingrid Taylar/Flickr hide caption

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Francisco Antolin, the driver and co-founder of Tell A Story, speaks to a couple of Danish tourists who purchased some books from his mobile bookstore. The converted van travels around Lisbon and sells translations of Portuguese literature. Laura Secorun Palet/ hide caption

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Patrick Roy's company, Coastal Rental Equipment, used to rent these large pumps to offshore divers who work for oil and natural gas drillers. After the BP oil spill, when the government introduced a moratorium on drilling in the Gulf of Mexico, the Patterson, La., business suffered losses and eventually shut down. Jeff Brady/NPR hide caption

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