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12/13: Colo. school shooter was targeting librarian; Secret Santa bears pre-Christmas gifts

|A student opened fire inside Arapahoe High School in Centennial, Colo., shooting and wounding two classmates before taking his own life. The gunman was apparently searching for a faculty member, who exited the school when he found out he was a target; and, Steve Hartman meets a man who dons a red coat every year and travels to different towns across America to distribute $100 bills.