Strenuous mental exercise like reading difficult books, solving tricky math problems — or, maybe, playing the right video game — can help keep a healthy brain sharp, research suggests. Images.com/Corbis hide caption

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The American Academy of Pediatrics recommends that children have no more than two hours a day of "screen time." Marilyn Nieves/iStockphoto.com hide caption

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BioShock Infinite revolves around an Aristotelian tragedy with tragic heroes, grounded in a floating city set in 1912. Courtesy of Irrational Games/2K Games hide caption

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Gears of War: Judgment hit stores on Tuesday. Courtesy Microsoft Studios hide caption

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Electronic Arts CEO John Riccitiello, seen here speaking at the E3 Expo in 2010, is stepping down, the company announced Monday. Michal Czerwonka/Getty Images hide caption

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A screenshot shows game designer Mike Mika's Donkey Kong: Pauline Edition he created for his daughter show she could play as a female hero. Screengrab via YouTube hide caption

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The Tomb Raider video game franchise started in 1996. The latest version of the game starring Lara Croft (a character played by Angelina Jolie in film adaptations) is being released Tuesday. Courtesy of Square Enix hide caption

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Nintendo's Wii U is the only new game system on the horizon as console makers are having a hard time figuring out how to improve on what they've got. Kevork Djansezian/Getty Images hide caption

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