take all of those numbers, put it on a computer screen, and tell us where the hot spots are and just how high the levels got. my cell phone measured within fcc limits. but the whole process was surprisingly low tech. what about different size skulls or children? in children, their skull is thinner, so the microwave radiation can penetrate deeper into the brain in children and young adults. and their cells are dividing at a much faster rate. reporter: but there have been no studies on chirp and cell phone safety. and the cell manufacturers advise putting the cell phone next to your head or on your body. take a look with the iphone 4, the safety instructions say when using the iphone near your body, keep it at least 15 millimeters away from your body.
it her own native bone was actually thought to be contaminated. take a look at the edges. they put in four little screws, two in the bone substitute n, two in the native skull and closed the skin over that, giving a normal contour back to her head again. another incredible story as well of recovery, a car hit rob summers and drove off leaving him paralyzed from the chest down. he did have some sensation in his legs, but that was it. that was five years ags go. this week summers and his doctors announced he s been able to stand up and even take steps under his own power with some assistance. he actually uses a harness that helps him along. doctors reestablished neuro connections by electrically stimulating rob s lower spinal cord. amazing story. we ll see some answers and solutions that it leads to for other spinal cord injured victims. coming up, i ll answer your questions about cell phone
be a potential risk. the public generally assumes if one is selling something on the market, that we have had assurances that that device is safe. reporter: to be clear, dr. blak s message is at odds with the largest study on cell phones. their conclusion, little or no evidence cell phones are associated with brain tumors. but if you look just one layer deeper into the appendix of that same study, it turns out participants in the study who use a cell phone for ten years or more, had double the rate of a type of tumor. and keep in mind, cell phone use in the united states has only been popular for around 15 years. back in 1996, there were 34 million cell phone users. today, nearly 300 million in use, according to industry figures. environmental factors take decades to see their effect, not a few years. reporter: if it may take decades to get a clearer answer, what can we say about cell phone safety now?
environmental factors take decades to see their effect, not a few years. reporter: if it may take decades to get a clearer answer, what can we say about cell phone safety now? scientists here in san jose, california are trying to answer that very question. one of the things we have to do first is literally put the brain inside the head. exactly. it s very light now. reporter: the fcc requires all cell phones emit below 1.6 watts per kilogram of radiation. in order to test for, that scientists here try and mimic the human brain, with salt, sugar, and water. let me show you how they do this test. this is a model. this is supposed to proximate the human skull, an adult male. this is my phone we ve attached there, connected at the angle most people would speak with. and inside over here, this liquid inside represents liquid brain. the phone is making a call.
children. in children their skull is thinner, their scrap is thinner. the mike tomorrow penetration can penetrate deeper into the brain of children and young adults. cells are divided at a much faster rate. impact of micro radiation can be much larger. but there have been no studies on children and cell phone safety. here is something else that might surprise you. the cell manufacturers advise against putting the cell phone right against your head. take a look at the iphone 4, it says when using the iphone near your body for voice calls, keep it at least 5/8 inch away from your body. blackberry says keep it .9 inches, meaning your head or your pocket. dr. keith black has been talking about this longer than many. the voices joining him are louder and more prominent.