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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A Kansas City family prepares a meal together. A new study finds that working mothers log more hours — and get more stressed — than working fathers while multitasking at home. (This family wasn't part of the research.) Allison Long/MCT /Landov hide caption

itoggle caption Allison Long/MCT /Landov