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Kitties don't play — they hunt. And their aloof appearance has evolutionary roots. A new book explains cats' mysterious nature and how their relationship with humans has changed over the years.

In her book Alone Together, psychologist Sherry Turkle explains how digital devices are affecting our communication and relationships. "What is so seductive about texting, about keeping that phone on, about that little red light on the BlackBerry, is you want to know who wants you," Turkle says.

In The Price of Inequality, Nobel Prize-winning economist Joseph Stiglitz argues that widely unequal societies don't function effectively or have stable economies. Even the rich will pay a steep price if economic inequalities continue to worsen, he says.

John Thavis covered the Vatican from Rome for nearly 30 years while working for the Catholic News Service. In his new book, The Vatican Diaries, he describes a place much less organized and hierarchical than the public imagines.

Since 2006, 40,000 people have been murdered in Mexico as drug cartels battle each other and the Mexican military. Journalist Ioan Grillo traces how Mexico came to control drug trafficking in El Narco.

On Friday, Regis Philbin will step down from his hosting duties on the talk show Live with Regis and Kelly. But that doesn't mean he's retiring. In his new memoir, How I Got This Way, Philbin chronicles the twists and turns of his career and explains where he plans to go next.

In his new book, the guitarist, singer and songwriter shares stories from life growing up in a musical household and talks about collaborating and sharing the stage with the likes of Rosemary Clooney, Frank Sinatra and Paul McCartney.

Musician Michael Feinstein chronicles his experience working as an archivist and cataloger for legendary songwriter Ira Gershwin. The book is presented through the stories of 12 of the Gershwin brothers' songs, including "Fascinating Rhythm," "The Man I Love" and "I Got Rhythm."

In her new novel, Emperor's Children author Claire Messud explores the complicated relationship between two women: Nora, who longed to be an artist and have a family but failed, and the woman Nora befriends, who puts her art first and built a family as well.

In 2003, a hospital nurse named Charlie Cullen was arrested under suspicion of injecting patients with lethal doses of a variety of medications. He is now considered one of the nation's most prolific serial killers. Journalist Charles Graeber explains how the hospital system failed to stop Cullen.