The National Cancer Institute at the U.S. National Institutes of Health says cell phones do emit radio frequency energy, a form of radiation

Today a there is an unprecedented warning from the U.S. on the risk of cancer among cellphone users. The director of a prominent cancer research institute, based on a not yet published study, is telling members of his own staff to limit their time on cellphones.  

Producer Zulima Palacio has the story. Carol Pearson narrates.