Photograph by President Obama's photographer, Pete Souza Pete Souza hide caption

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Gal Beckerman is the author of When They Come for Us, We'll Be Gone: The Epic Struggle to Save Soviet Jewry. Houghton Mifflin Harcourt hide caption

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Presidential candidate Dilma Rousseff (center) campaigns in Belo Horizonte, Brazil, alongside outgoing President Luiz Inacio Lula da Silva. Pedro Vilela/AFP/Getty Images hide caption

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Born Ehrich Weiss, Harry Houdini, a rabbi's son, emigrated from Budapest to Appleton, Wis., in 1878. Courtesy of The National Portrait Gallery/Smithsonian Institution hide caption

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The late Maj. Ronald Keith McQueen poses in an undated photo. McQueen died recently and was the uncle of NPR's Tell Me More host Michel Martin. Family photo hide caption

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Adolf Hitler (right) with his foreign minister, Joachim von Ribbentrop, in 1941. A new study states that Germany's foreign ministry staff cooperated in the Holocaust much more than has previously been acknowledged. Von Ribbentrop was hanged for war crimes after the Nuremberg trials. AFP/AFP/Getty Images hide caption

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Construction worker Jimmy Martinez works at a site funded by federal stimulus money in Lakewood, Colo. Economic historian Niall Ferguson cautions that another stimulus would carry tremendous risk. John Moore/Getty Images hide caption

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