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Warnings advise don't hold the phone directly on the body. the test system for testing phones today which gives you the specific absorption rate uses a spacer here for every millimeter away from the brain you get a 15% reduction in radiation to the body. >> what's the worst case scenario? if you extrapolate numbers you just talked about, how bad could this be? >> it could be a global epidemic. people have a right to know there are simple things to do. you have to have more of a public conversation about this. we are poorly served by reassurances that everything is okay by misuse of science. it...

what surprised me is voices urging caution are not only getting louder, but they're getting more prominent. >> all right. i'm on my way. >> if you've ever put a cell phone to your ear, you should listen to what neurosurgeon dr. keith black has to say. >> there's no way to say that cell phone use is safe. i think the public has a right to know there could be a potential risk. the public generally assumes that if one is selling something on the market, that we have had assurances that that device is safe. >> to be clear, dr. black's message is at odds with headlines from the largest in...

People are growing up in a sea of radio frequency radiation that didn't exist even five years ago. >> we've been surrounded by radiation for a long time. you're saying this new radiation has changed the amount that we're exposed to? >> by billions and billions and billions of times. the amount of radio frequency radiation today is billions of times greater than occurred at the big bang through which we evolved human life. i don't think all microwave radiation is necessarily problematic. i recognize that microwaves play a very important role in many aspects of modern life. but i think direct mi...

The test system for testing phones today which gives you the specific absorption rate uses a spacer here for every millimeter away from the brain you get a 15% reduction in radiation to the body. >> what's the worst case scenar scenario? if you extrapolate numbers you just talked about, how bad could this be? >> it would be a global epidemic. people have a right to know there are simple things to do. you have to have more of a public conversation about this. we are poorly served by reassurances that everything is okay by misuse of science. it's not helping us. it's not helping our children. >>...

paraplegics. this guy could stand up again. this is when an accident paralyzed five years ago and doctors said he would never walk again. a medical team implanted an electric stimulator and within months he was taking assisted steps on a treadmill. i'll be back at the top of the hour with more live news here. >> i'm dr. sanjay gupta. welcome to the show. today i'm taking a closer look at something that's become so closely woven into our lives it's hard to imagine what we would do without it. i'm talking about our cell phones. most of us take it for granted that they're safe and that ...