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Business. >> do you roll over or do you fight? i'm a fighter. >> now, we can't say for sure whether alan marks' tumor, in fact, was caused by cell phones, but as we said, he's certainly a fighter. good luck to him and his family. also moving forward in the condition of gabrielle giffords. she underwent surgery to replace a piece of her skull that doctors removed months ago because of brain swelling. surgeons took a bone substitute and actually placed it in her own native bone which was saved but actually thought to be contaminated. they put in little plates, two little screws in the native s...

Next to your head. that is something marks and his family support. >> i still use my phone. i usually use the speaker phone or i use the headset. >> reporter: marks and his wife are urging lawmakers around the country to require manufacturers to put warnings directly on the phones. they believe having the safety information in the manual simply isn't enough. today marks is able to provide for his family again and is back on top in the real estate business. >> do you roll over or do you fight? i'm a fighter. >> we can't say for sure whether alan marks' tumor was caused by cell phones. he's cert...

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 ...

surgery. police in mexico arrested the leader of one of the country's most notorious drug reasons. balderas operated the gang. i talked to a former dea agent a short time ago. >> this is major. you've got to remember this gang was responsible for large shipments over a long period of time, over ten years, coming from mexico to united states. you're talking about cocaine, marijuana. also, because they were able to free up the borders and get control over the borders, there is methamphetamine and heroin that crossed the borders as well. >> barragan was wanted in the united states. th...

How much, a significant portion of the left side, and the bone piece itself is about that size. so it's -- you know, it's something that's done quite frequently and the skin is closed over this area, but there's a concavity. >> so the skin grows back over it? or they graft skin on? >> there's an incision made and after the operation is performed, the skin is brought back together. and put together with sutures. but to your point, the only thing protecting the underlying brain now is that layer of skin. the bone is gone. so if a person were to fall or something were to injure this area of the h...