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In addition to being able to mentally handle it, radiation would be a big concern. consider this. beyond low earth orbit, the protection of the earth's atmosphere is gone. nasa says astronauts are exposed to radiation, anywhere from 50 to 2000 mili receive verts. it is equivalent to three chest x-rays. that's an exposure equal to at many as 6,000 chest x-rays. >> with all that you have learned and all you have seen, do you think mars is feasible. >> i think mars is feasible. there are certain challenges. the radiation environment is something we are going to have to figure out. we get protecti...

Hospital in el paso, texas, last october where his parents just found out he may have been exposed to tuberculosis. >> he was minutes old and wasn't able to protect him is secure i. >> reporter: parents of more than 700 babies rushing them for chest x-rays and skin tests after earning a hospital employee tested positive for the contagious disease. >> a female nurse in the nursery. >> reporter: some parents wondering why so much time passed before the hospital sent out letters notifying them of the risk. >> i'm not so happy of the fact it's been over a year and it's now being brought to the att...

It about a 10% chance they could develop it at some point in their lifetime. all of those students will be treated with antibiotics. five students have been sent for further tests, because chest x-rays showed that there was some abnormalities that may or may not be related to tb. they still don't know. so out of an abundance of caution, school officials say they're testing all 1,800 people at this school. students and staff alike. we spoke with the principal of the school and the county health director. here's what they had to say. >> i also am a parent. i have a senior girl and a freshman boy...

Studies you should know about. this one came out. it finds that c.a.t. scans are more effective than x-rays for lung cancer. who should be screened for lung cancer, just smokers? >> if you are age between 65 and 74 and you smoked one pack for 30 years or ex-smoker and you stopped, you should listen up to this segment you need to be screened. now historically we use chest x-ray or cytology to find out if there is any cancer. now, the study, we mentioned eight few months ago, now they are definitely telling you that low dose c.a.t. scans can detect legions -- lesions. they looked at 26,000 peopl...

All of boston's world famous hospitals are operating in overdrive. at mass general, boston's biggest hospital in the center of the city, there were 72 confirmed cases of the flu last week alone. shane has a temperature of 104 degrees. he's already been out of work for four days. >> it's costing me financially and lost time, and maybe my job. >> you ought to be wearing the mask when you're in public and keep yourself away from people. wash your hands all the time. >> reporter: four miles away back at children's hospital, cassie now needs chest x-rays, her lungs full of mucous. just down the hal...