feelings on the consumer financial protection bureau, i'll be tweeting a link to it in a minute. you can follow me on twitter. let me know what you think. i do read all your comments, even the nasty ones. thanks for joining the conversation on "your monday. we're here every saturday. you can catch christine romance on "your bottom line" saturday mornings at 9:30 a.m. eastern. have a great weekend. -- captions by vitac -- www.vitac.com you're in the cnn newsroom where the news unfolds live this saturday, may 21st. i'm fredricka whitfield. a manhunt is under way in oklahoma city for two men who shot and wounded an off-duty deputy. major john waldenville was working security at a restaurant overnight when the gunman shot him in the head. the 25-year-old veteran is listed in critical but stable condition after undergoing

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. the united states offered a $5 million reward for his capture. a suicide bomber attacked an afghan military hospital in kabul. a taliban spokesman claims 51 people died including

foreigners. the afghan government puts the death toll at six with 26 others injured. the attack comes as general david petraeus warns of a summer surge in high-profile taliban attacks. the obama administration is sending an envoy to north korea for the first time in two years. robert king is the u.s. state department special envoy for north korean human rights. the white house says next week king will begin a five-day tour to look into the country's need for food. the u.s. cut off food aid to north korea two years ago. the water is rising. your neighbors are evacuating. what can you do? how about build your own levee. martin savidge found one family near vicksburg, mississippi, that did just that. take a look. so far it is keeping the flood waters at bay and keeping three acres and the homestead high and dry. >> when it got to 55.5, we knew we had to do something. >> it's worked. so far it's holding.

>> so far it's holding. we started designing a levee to hold 105 feet. then it came it was going to be 107, and when we started we said we're going to put it high as the levee will go, at 110 feet. that's what we built, sea level. >> so far, so good. martin says the homeowner told him the family always wanted lake front property. some people keeping a great sense of humor. this is very serious. they're lucky. so far, so good. >> well, they worked for it, didn't they? it's amazing to think that all that effort paying off for now. but the thing that people have to keep in mind, not just with that one home, but also with the entire levee system, is that even though some of these places have crested or in the process of cresting, those things still have to hold for days, if not weeks still ahead. >> that's going to be the real test for them as well. >> so if we get through this entire event and everything holds through, that's incredible

to think a system that is dozens and dozens of years old is still doing its job. let's talk a little bit about a few things in the forecast that concerns me a little bit coming up with the flood situation. the weather pattern has changed and things are becoming a little more active. wet weather going to be moving in over the middle mississippi river valley and the ohio river valley. at this hour things are looking pretty good here. the only thing that's really happening is in the upper mississippi river valley. you say can this make its way all the way downstream? yes, it will. we don't think lit be heavy enough. in minnesota, way up here is the source of the mississippi river. it takes about 90 days for a drop of rain to make its way down to the gulf of mexico. let's talk about the rain in the next five days. we think things will become active later this evening. the big focus of the heavy rain is going to be in the ohio river valley where we can see at much as three to six inches of rain. that's probably through the middle of next week. the ohio, remember, dumps into

the lower mississippi river valley. this i don't think is going to be enough to necessarily bring those levels back up to where they were before or bring them back up to record levels for those of you that have receded. it could be enough that it could keep the levels elevated a little longer, keep the crest around a little higher, keep flood stage around a little bit longer. this is the forecast. we've crested in vicksburg, we're cresting in red river valley -- landing, excuse me, as well as natchez and retaining the man-made flow in baton rouge and new orleans. we're still looking at three weeks, talking middle of june, fredicka, before all the areas will be above flood stage. >> that's incredible. thanks so much, jacqui. we'll check back with you throughout the afternoon. meantime, politics now. a big day in the world of politics. let's start off in atlanta where a new name has been added to the list of gop candidates.

herman cane officially declared his candidacy. the former ceo of godfather's pizza told e supporters why he felt the need to run. >> we have become a nation of crises. we have a moral crisis. we've got an economic crisis. we've got an entitlement spending crisis. we've got an immigration crisis. we've got a foggy foreign affairs crisis. and we've got a deficiency of leadership crisis in the white house. >> cain is a tea party favorite, but he is trailing his gop rivals in early polls. former utah governor jon huntsman is making a swing through new hampshire prior to a probable run for the white house. he spoke at southern new hampshire university's graduation today. he didn't make an announcement.

>> talk about putting somebody on the spot. the only announcement i have here today is to say that your president, president leblanc looks pretty darn studly in the bling he's got around his neck. barack obama actually delivered the commencement speech at that same school four years ago. another republican could soon toss his hat into the ring. former minnesota governor tim pawlenty is expected to announce his candidacy for president monday. he has picked a special place to do that, neighboring iowa. that's where the caucus kickoff usually takes place for the presidential primary calendar. getting your child to become an independent, financially strong person, we have five simple steps next. and after that, tennis champ venus williams talks about the industry that sidelines her and tells me face to face what she's

thinking when she competes against her sister serena. and pure honey. nature valley -- 100% natural. 100% delicious.

personal pricing now on brakes. tell us what you want to pay. we do our best to make that work. deal! my money. my choice. my meineke. it's graduation season. for some of you that means your children are going to school or starting work. karen lee joins us to make sure you're financially savvy. it's not your parents' responsibility to get you on board but yours as well. most kids when they're graduating from high school or even college, they're not

thinking about their financial future. >> no. they're thinking about the here and now. >> i have a high school senior. he's going to college. i thought, i've got three months. >> congrats on that. >> thank you. three months to teach him the skills he'll need to go off to college. the things we're going talk about, you'll be shocked when you think about, they've never gone to the bank and deposited a check. >> what do you want him to do first? >> the first thing we started with. this is a list of what i'm doing with my son. i've done some of them but not all of them, but i will before the summer is over. the first is the banking skills. he already had a savings account. we set up checking, got a small amount in there. got him going online, figuring out how to transfer, make a check, make a deposit through the atm. >> so really some kids graduate from high school and college and have never done that before? >> sure, if they don't have their own checking account.

go over all the hidden fees. he had no idea if you go to a different machine, there's going to be a fee here. >> it adds up. >> that's right. that's the banking. of course, make sure you go overdraft, minimum balances, any of the hidden fees. the next thing is going to be credit cards and debit cards. >> especially for incoming freshmen, it's extraordinary how the credit companies seek out kids. you're trying to figure out your schedule, and now you're trying to make a decision about a credit card. >> my children know that they are not to deal with those offers, that mommy will get them aa credit card when we're ready. what i'm doing to get him started, he already has one of my credit cards in his wallet for emergencies. i'll do what i do with my office staff which is, i've got the control account. he's going to have his own so we can segment out just his charges, teach him how to establish an online access so he can look at what he's got charging. it's going to be his responsibility to pay it off each month. >> my mom did that.

thanks mom. she did that a while back. >> we'll set a pretty low limit. the other thing real important is help them understand what a late fee is, what a finance or interest charge is. again, they don't know. >> so you've got to really hammer the message home about budgeting, though. you know what? you don't have it. don't spend it. that will come later. >> it will. when i thought about this, i thought this is going to be a hard one, to teach a college kid because really you're already paying for their room and board. what kind of bills do they have? we'll do it with spending money. we'll set him up, is it 50 buck as week or 75. >> allowance. >> what i'll do is i'll suggest i'll put it in his account every two weeks just like a paycheck. he'll use that for spending or the credit card bill. here is the tough part for parents, you cannot send them extra money. if they call -- >> if they get in trouble, tuition is taken care of, board,

all that good stuff, food. if they get in trouble, this is the time to say this is your tough lesson. >> tough love. ask me in six months if i can stick to it. that's my plan right now. >> crack that whip. i know you can do it. >> i hope so. this came to me later as i was thinking about this segment, to start to introduce to them what we think might be higher level concepts. but insurance. >> kids are not thinking about that. >> and saving. >> definitely not thinking about that. >> how about the fact that when my kid gets his first job, i'm hoping he'll pay his own car insurance, his own health insurance. is that a reasonable expectation? >> if he's got a job. >> i'd like to think so. he has no idea what we pay for those things. one other thing that smashed me to call my homeowner's company and find out, we're sending him to college with a mu mac book. is that covered under homeowners? >> interesting. >> if you live on campus -- for theft. if you live on campus, it would be covered. if you live in an apartment, you

should get renter's insurance. they suggested. they said, karen, you're not going to make a claim, you've got a $1,000 deductible. they suggested i buy a personal article policy. for a $1,000 computer 30 bucks for the whole year. >> bottom line, as they get ready to embark on their lives postgrad asian high school or college, they need to think about the big picture, your future, period and include the finances. >> you as a parent, it's probably one of your final things to teach them. the last thing most important, you need to paint a picture for them of your expectations. i've been saying to my son for several years, you're off my payroll in four years. >> i'm not bailing you out. >> that's right. paint that picture if they're living at home. a lot of kids aren't finding jobs. if they live at home, i recommend they perhaps pay a little rent, cover some grocery money, set some expectations. >> karen lee, thanks so much and all the best to your grad.

>> thank you. >> nerve-racking, too. congrats. that's great. you can reach karen at karenleeandassociates.com. it's been four months since tennis-great venus williams played in a tournament. >> would you have your druthers, would you be more anxious to be on the clay court of the french or the grass of womenal done. >> i would say more anxious on the clay court and the grass. >> trick question and trick answer. face to face with venus williams after this.

tennis star venus williams turns 31 in just a few weeks, returning to a grand slam tournament would be the perfect birthday present. perhaps that's why she did sign up for the international in the uk. the early june event is considered kind of a warmup for wimbledon. she says she's nursing a muscle injury carefully and knocking down any rumors that she's considering retirement any time soon. four months ago venus williams was at the australian open doubled over in pain, making an early exit. now, back at home in palm beach gardens, florida, all 6'2" of her standing tall, relaxed, seemingly taking it all in stride. i met up with williams at her

favorite practice courts. she tells me face to face she's upbeat. >> what is the injury specifically? >> i tore about three inches in my muscle. >> this is a groin injury? >> a muscle that runs from the groin straight through the stomach. a pretty severe tear. >> where do you feel you are right now, 50, 60, 70, 80? >> i think 70%, 80%. >> not quite ready to do this again. not yet. >> i just go lightly and try to pay attention to my doctor's advice and just keep re-evaluating week by week. i do get better week by week. >> she admits it's frustrating being sidelined. >> you like to win? >> i love to win, not just like. it's addictive. >> as much as she misses competing -- >> do you dare go to any of the tournaments? >> i've been playing 17 years. i've been to a good amount of

tournaments, i don't necessarily need to be a spectator. i've drawn the line now. i can't watch anymore on tv because i deserve to be out there. >> will she be ready in time for this month's french open or june's womenal done? >> would you have your druthers whether you would be more anxious on the clay court of the french or the grass of womenal done? >> i would say i would be more anxious to be on a clay court and the grass. i hope that answers your question. >> professional tennis hasn't been the same without her. absent, her more than 100-mile-per-hour serves, her showstopping, personally designed outfits, the hits and the misses. >> this is the famous french open dress, exposed. >> talk about exposed, what about those flesh-toned bloomers that caused such a stir. >> the nude bloomers have officially been retired. >> you're very much a girly

girl, right? >> i'm a tough girly girl. >> she keeps a sense of humor. she's recovering, but the winner of 21 grand slam titles and three olympic meddles is far from retiring. >> no. definitely at the top of my game and had a couple injuries lately that have been some bad luck. >> among the opponents she can't wait to take on again, her 29-year-old sister serena recovering from her own medical scare, a pulmonary embolism just two months ago. >> thankfully serena was able to get treatment, so that way she can lead a healthy, happy life. >> and to anyone whoever doubted their genuine competitiveness in eight grand slam finals, it's complicated, but very real she says. >> there was one year, maybe '08 where i was playing -- we had to play each other in the wimbledon final and i sprained my thumb so bad, but i really couldn't hit a back hand, but i couldn't tell

her that in the double. i had to suck it up like nothing was wrong. >> this time on her return, venus williams wants everything to be right. venus is not on the court this weekend as the french open as begun. when she and i spoke, there was still a little bit of time to sign up for the french open. but no, not going to happen. who knows? there stale may be wimbledon. venus talks more about the sibling rivalry with her sister and a personal milestone just around the corner. more in the next hour. a country music superstar is moved to action after seeing devastated alabama and wants you to join him, a challenge from hank williams junior next. 

the biggest stars of country music are doing what they do best, performing, to raise money for the families of the tornado-ravaged south. one of those stars wants you to join him, to impact your world. >> i'm hank williams junior. you can make an impact to help the people of alabama, georgia,

mississippi, that have been totally devastated by the worst disaster in the history of the state. >> you have to be here. you just can't describe it. it's absolutely unbelievable. >> these cities need, not millions, they need billions. help is on the way. america can survive and alabama can survive. so please join the movement "impact your world." go to cnn.com/impact. meantime, some people are saying today is doomsday. i'm asking for your tweets on this judgment day. one viewer says, quote, i'm playing "rap tour" by blon difficult all day long. another one says i'm drinking and repenting for all my bad deeds. more of your comments throughout the afternoon. first, do you use ear plugs for your cell phone? find out why you should, next on a special dr. sanjay gupta m.d. right here.

before you begin an aspirin regimen. talk to your doctor, and take care of what you have to take care of.

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'd do without it. i'm talking about our cell phones. most of us take for granted that they're safe. that may be the case. i've also spent the last several months investigating and talking with people who say don't be so

sure. some of you may already be rolling your eyes. i understand that. but i want you to stick with me this half hour. we've been digging a little deeper to try to get a more definitive answer. ill teal you this, it wasn't easy. what surprised me is that the voices urging caution are not only getting louder, but getting more prominent. 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 cell phone use is safe. i think the public has a right to know that 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 international study on cell phones an cancer. 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, and you'll see something unsettling. turns out participants in the study who used a cell phone for ten years or more, had double the rate of brain glioma, a type of tumor. keep in mind cell phone use in the united states has only been popular for 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. >> if it may take decades to get a clearer answer, what can we say about cell phone safety now? scientists in san diego, californsan jose are trying to find the answer. >> one thing we have to do is put the brain inside the head: the fcc requires they owe mitt

1.6 watts per kilogram of radiation. order to test for that, krin tifts try to mimic the human brain with salt, sugar and water. let me show you precisely how they do this test. this is a model. this is supposed to approximate the human skull. an adult male. this is my phone we've actually attached there, connected at the angle most people would speak with. inside over here, very important, this bubbly liquid inside, that's what represents liquid brain. what's going to happen is the phone is making a call. after a period of time this device is going to come over here and start to measure radiation at all sorts of different points in the brain. after that they're going to take all of those numbers, basically 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, well, surprisingly low tech, and what about different-size skulls or

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.

the city of san francisco pushed for radiation warning labels on cell phones. the head of a prominent cancer research institute sent a memo to all employees urging them to limit cell phone use because of possible risk of cancer. the european environmental agency has pushed for more studies saying cell phones could be as big a public health risk as smoking, asbestos and leaded gasoline. >> the fcc set the guidelines for how much radiation a cell phone can emit and they say they're safe. but how can they be so sure? keeping them honest, we decided to come here to try to find out for ourselves. that's declined an on-camera interview. the type of radiation coming out of the cell phone is called nonionizing. >> what micro radiation does in the most simplistic term is very

similar to what happens to your food when you put your food in a microwave oven. it's essentially cooking the brain. >> based on their past statements, the fcc isn't convinced there's a real risk and maintain they, quote, do not endorse the need for consumers to take any precautions to reduce exposure. i'll tell you, as a neurosurgeon, as a journalist, a guy who personally has three cell phones, i believe this is an important issue to investigate. for what it's worth, i haven't met anyone who says don't use a cell phone. that's not even realistic in today's age. there are things you can do, steps you can take to minimize your risk from radiation. if you're concerned about that, aisle show you those during the show. coming up first, we'll dig even deeper into this and you'll hear my conversation with a scientist who has been studying this for over 20 years. i'll be right back with a special look at cell phone safety. we're adding new cell sites... increasing network capacity,

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we are back with a very special sgmd talking about cell phone safety. the most recent study is by researchers at the national institutes of health. they found that the radiation emitted from your cell phone increased brain cell activity after about 15 minutes of talk time. let me show you what i'm talking about. these are natural scans of the brain looking at glucose metabolism. this is with the cell phone on. look how much yellow is in this area around the brain compared to when the cell phone is off, very little yellow comparatively

speaking. this is one of the first studies to show there is an impact from using cell phones actually on the brain. we don't know if it's good or bad right now. these are preliminary findings. there may be concerns, for example, among people who already have some sort of brain problem. for example, if someone has a brain tumor, you can see increased glucose metabolism, because the cancer is a high activity part of the brain, could that worsen it? that's questions that researchers have raised. they say they're committed to studying it further. it all comes back to a question of safety. i should tell you now right off the bat what we're talking about is highly controversial. we've talked to industry experts who say the scientific evidence overwhelmingly indicated wireless devices don't pose a public health risk. i've talked to scientists an doctors who say, we just don't know. then there are people like debra davis, former white house senior health adviser who founded a group called environmental

health trust. she studies the issue for decades, in particular, the amount of radiation cell phones give off and what your body might absorb. you may not agree with what you're about to hear, what she has to say. but i think it's important to hear. >> why did you get interested in cell phones? >> because i knew of the history of tobacco and asbestos. >> just because there's other issues that become problematic doesn't mean everything is going to become problematic. >> of course not. but in this particular case i knew about none eye nizing radiation, to recognize there were biological effects. when i went back and looked at the history of science, i learned that the navy had warnings and had developed ways to protect personnel against some of these exposures and i became curious. >> as you talk about, and a lot of people do, everybody has one nowada nowadays. >> i prefer to think we were naive and the reason we're talking is we're no longer so naive about this issue.

i think there's a recognition that the governments of france and israel have issued warnings. those are not countries to take these issues lightly. i am particularly concerned as a grandmother about the developing brain, about children using cell phones, about toddlers and infants whose parents are downloading white noise apps and lull la byes. we are so naive about technology. cell phones have revolutionized our lives. you can respond to medical emergencies, very valuable. people have a right to know that cell phones are basically small two-way microwave radios. >> a lot of people listening will say, look, i thought this was studied and if there was something bad here, we would already know about it. >> studies of the hiroshima bombing, we know that brain cancer did not show up at all as increased until 40 years after that bombing occurred.

>> when you put it like that, it seems to make sense that we certainly just don't know, enough time has not passed to be able to say anything definitive. the jury seems to be pretty clear on this. >> i don't think the jury is clear in other nations right now. i think the nature is to do with the old-fashioned issue. the cell phone industry has been very, very powerful and is very influential on both sides of the aisle. all of us, including me, don't want to give up our phones. >> over ten years, the effect of using a phone, would you describe it as a cumulative problem? are you a accumulating the problems in your brain? >> it is a cumulative problem. as we know what happens with many things that can cause cancer, it may not be the one exposure. look, we are born with repair processes. we get damage to our dna by breathing, sunlight and whatnot. if we eat well and exercise and don't get too much exposure, that damage gets repaired. for cell phone radiation, young

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 microwave radiation of the brain -- and that's why all the fine print warnings advise -- don't hold the phone directly on the body. in fact, 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 is the worst case scenario, if you extrapolate the 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. we've got 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 or our children. >> we also had a long conversation with john walsh from the industry group that represents cell phone makers. they say they're maintaining the guidelinesed enforced by our own government and defer to the fcc that says cell phones are safe. we tried several times to ask the fcc how could they be so sure they're safe based on the data we've seen and asked why don't they independently test phones for safety? they wouldn't speak to us about this. they referred us to the website, saying, quote, the fcc does not endorse the need for any of

these practices. a real estate agent who used a cell phone all the time -- many of us do -- he thinks in his case it gave him a brain tumor and he's fighting back. we'll tell you his story next on "sgmd." ♪ you love money ♪ well, you know i love it too ♪ ♪ you love money ♪ well, you know i love it too ♪ ♪ i work so hard at my job ♪ and then i bring it home to you ♪ ♪ i love money in my pocket

we are back. i'm dr. sanjay gupta. our focus this week is cell phone safety. during our investigation we metal an marks, a successful businessman with a remarkable story. his life-changing battle with brain cancer led him on this unique journey that took him all the way to capitol hill doing something he never expected to do. >> good morning. >> reporter: for alan marks, being in the real estate business for 30 years has been a passion. >> i like building homes and seeing people move into them happy. >> reporter: three years ago his life changed. >> i had a seizure. i don't remember it. >> reporter: the cause of that

seizure, a malignant brain tumor. surgeons were able to remove the cancer. he says the recuperation was challenging. >> it took a long time. even now i have some deficits. you try to find ways to overcome them. >> reporter: there's something else. marks feels responsible for his own cancer. >> i know what it is. it was my cell phone use. there's no way you can put something to your head for 20 years and not have it cause something. >> reporter: while there are some studies suggesting cell phones pose a health risk, many others do not. as the trade group representing cell phone manufacturers tells cnn, numerous experts and government health and safety organizations around the world reviewed the existing database of studies and on going research and concluded that rf products meeting established safety guidelines pose no known health risk. still there are many cell phone manufacturers that recommend that you do not put the phone

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 certainly a fighter. good luck to him and his family. a big step forward in the recovery and rehabilitation of congresswoman gabrielle giffords. she underwent an operation to replace a piece of her skull that doctors removed four months ago because of brain swelling. her surgeons took a bone substitute and actually placed

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

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we're back. as you know by now we're talking about cell phone safety and have a lot of questions about this. i have to share this one with you. this is about the viral video. take a look. i'll tell you off the top, this is not real. this is a hoax. the question is can cell phones really pop popcorn. no, they can't. that's not the type of radiation we're talking about, again, while entertaining, just a hoax that video. we do have a lot of important

questions, legitimate ones we want to get to. this one from our blog. if cell phones cause cancer, wouldn't we have seen a huge increase in brain cancer recently? very important question again. the answer is sort of this idea that, not necessarily because it takes a period of time for cancers to develop. cell phones have become popular in this country over the last 15 years. only about 30 million cell phones in this country in 1996 and now ten times as many. 300 million. people use their cell phones more. it takes 20 to 30 years for these tumors to develop. another question now. i'm a parent with a child that keeps her phone stuck to her head. what's the greatest risk for her? >> first of all, i can tell you the greatest risk for parents is you don't get to talk to your child as much anymore. going through a little bit of that myself. think of children not as small adults. they have thinner scalps and skulls. as a result, radiation may penetrate more greatly. that's of concern.

that's something dr. black brought up. that's what i found striking. there have been no studies on children and cell phones, nothing in a pieepeer-reviewed journals. also cell phones can be extremely distracting, their sleep schedule may be change, think of these as mini computers. they can be just as stimulating as a television. many stay up playing on their various phones versus winding down. let's get to another question now. this one, i text on my phone more often than talking. is radiation from texting the same as a phone call? here is the good news is that it's not. texting is a much safer alternative the amount of radiation resolves the farther you are away from your phone. people know i use my wired earpiece all the time, been