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Gen. David Petraeus is the subject of The Insurgents: David Petraeus and the Plot to Change the American Way of War, a new book by Fred Kaplan. Shah Marai/AFP/Getty Images hide caption

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American poet Robert Frost, shown here in 1955, died on Jan. 29, 1963. Now, 50 years after his death, a rare collection of letters, audio and photographs sheds new light on his religious beliefs. AP hide caption

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Data gleaned from e-readers gives writers a new kind of feedback to take into consideration — or ignore. iStockphoto.com hide caption

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Visitors take in a re-created scene at the massacre museum at Vietnam's My Lai village. Researcher Nick Turse says atrocities of all kinds were more common in the Vietnam War than most Americans believe. Hoang Dinh Nam/AFP/Getty Images hide caption

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