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In this Thursday, Oct. 11, 2012, file photo, a pedestrian talking on a cellphone is silhouetted in front of a fountain in Philadelphia. Two U.S. government agencies are giving conflicting interpretations of a safety study on cellphone radiation: One says it causes cancer in rats. The other says there's no reason for people to worry. (AP Photo/Matt Rourke) ** FILE **

In this Thursday, Oct. 11, 2012, file photo, a pedestrian talking on a cellphone is silhouetted in front of a fountain in Philadelphia. Two U.S. government agencies are giving conflicting interpretations of a safety study on cellphone radiation: One says it causes cancer in rats. The other says there's no reason for people to worry. (AP Photo/Matt Rourke) ** FILE **

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