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A brisk walk each day for a minimum of 20 minutes could lead to considerable health benefits, according to a new study that suggests the sedentary lifestyle is responsible for twice as many deaths as obesity.The good news is that even a modest amount of exercise could make a difference as long as it's regularly performed, say the researchers, whose study was published in the American Journal of Clinical Nutrition.

In this month’s episode of Tech Therapy, The Chronicle’s monthly technology podcast, Ronald A. Yaros, an assistant professor specializing in mobile journalism at the University of Maryland at College Park, describes an iPhone app he developed for his courses. He also talks about his vision for helping students prepare for a business world in which smartphones will very likely be the norm.

"One of the challenges and important priorities for K-12 today has to be broadening our understanding of what it means to be a digital citizen," says Joseph Kahne, Davidson professor of education at Mills College in Oakland, CA, and chairman of the MacArthur Network on Youth and Participatory Politics, "so that we're talking about young people as producers and managers of information and perspectives, and not simply as people we need to keep safe and civil."

if K-12 wants discontinuous, substantive improvement in student achievement, then it needs to change its pedagogical practices to better exploit the affordances of the computer