FILE - In this Sept. 11, 2001, file photo, the twin towers of the World Trade Center burn behind the Empire State Building in New York. The Sept. 11, 2001 terrorist attack is by far the most memorable moment shared by television viewers during the past 50 years, a study released on Wednesday, July 11, 2012, concluded. (AP Photo/Marty Lederhandler, File) Photo: Marty Lederhandler
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