SAN FRANCISCO - JULY 24: A pedestrian talks on her cellular phone as she walks down the street July 24, 2008 in San Francisco, California. Dr. Ronald B. Herberman, director of the University of Pittsburgh Cancer Institute, has issued a warning to his faculty and staff of nearly 3,000 to use their cell phones less because of possible cancer risk. Dr. Herberman says adults should use speakerphone or wireless ear devices to reduce exposure to electromagnetic radiation. Getty Images logo Getty Images 24 months ago

SAN FRANCISCO - JULY 24: A pedestrian talks on her cellular phone as she walks down the street July 24, 2008 in San Francisco, California. Dr. Ronald B. Herberman, director of the University of Pittsburgh Cancer Institute, has issued a warning to his faculty and staff of nearly 3,000 to use their cell phones less because of possible cancer risk. Dr. Herberman says adults should use speakerphone or wireless ear devices to reduce exposure to electromagnetic radiation.

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