Science and technology

Associated Press
In this Tuesday, Aug. 14, 2012 photo Leana Wen, of Boston, who is doing her medical residency in emergency medicine at Harvard-affiliated Brigham and Women's Hospital and Massachusetts General Hospital, works on a computer at Brigham and Women's in Boston. Wen chose emergency medicine because the hours are more flexible than those of primary care physicians. (AP Photo/Steven Senne)

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