Soldiers participate in physical therapy while using a prosthetic brace called the Intrepid Dynamic Exoskeletal Orthosis (IDEO), which allows them to use and strengthen severely injured legs. John Moore/Getty Images hide caption

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Sean Morey, then with the Arizona Cardinals, celebrates after blocking a punt against the Seattle Seahawks in 2007. Morey, who suffers from post-concussion syndrome, retired from the NFL in 2010 on the advice of doctors. Stephen Dunn/Getty Images hide caption

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Roberto de Carvalho (left), who maintains a truck fleet in Recife, Brazil, is shown here with his daughter Sandra, 22, wife Enilda and daughter Susana, 16. The family makes just enough to belong the rapidly expanding ranks of the country's middle class, though they still can't afford a house or even a car. Melissa Block/NPR hide caption

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Microwave pralines are easier to make than stovetop pralines, and just as tasty. Ed Anderson/Chronicle Books hide caption

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The new Moto X launched Thursday in New York City. Bryan Bedder/Getty Images hide caption

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Born in Texas and settled in Nashville, Tenn., Guy Clark has mentored generations of artists, including Rodney Crowell, Lyle Lovett and Steve Earle — all of whom cite his keen editing skills and prize his stamp of approval. Jim McGuire/Courtesy of the artist hide caption

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ATF Special Agent Charles Houser runs the National Tracing Center in Martinsburg, W.Va. Melissa Block/NPR hide caption

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Gun enthusiast Paul Gwaltney at Blue Ridge Arsenal, in Chantilly, Va. Gwaltney, an NPR listener, agreed to host a discussion about guns with friends and colleagues. Becky Lettenberger/NPR hide caption

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Led by the Rev. Willie Phillips (center), protesters march in February against violence in and around Club Majestic. Mike Haskey/Courtesy of The Ledger Enquirer hide caption

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