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>> dr. siegel, let's get to the physical implications. we were discussing in the break that the exxon valdez, the physical implications of disease never studied. what are your fears about this spill? >> well, gretchen, actually, dr. keith said something that's relevant here which is to the physical side, we have a much more dense population here of people and the spill is so enormous compared to exxon valdez. what you actually see short term is you see problems with breathing, skin problems, nausea, headache. now, with exxon valdez, 11,000 workers sought medical treatment and the ones that wer...

Accidents, coastguard estimates 80 plus percent really goes back to human factors. they'll look at the mechanical side very carefully and hopefully, they'll uncover something. you've got to look at the whole picture. >> gregg: they have black boxes aboard planes. some vessels on the water do carry video cams. do we need more of those? >> you put out the right question. there is no reason in the world why we can't have cameras in the pilot houses of ferries all across the country. then there really is going to be very little debate about exactly what was happening and exactly who was doing what...

Acquaint them with what's going on. we have no reason to believe that that might happen right now but because the concern are raised we're certainly looking into it. >> admiral thad allen we certainly appreciate your time right now and especially given how busy you are. thank you, sir, for joining us. >> my pleasure, campbell, thank you. >> still ahead, an alarming new study shows cancer risks are everywhere. in your food, clothing, and even the air you breathe. what you can do to protect yourself and your children. dr. sanjay gupta will be here next. chevy malibu stands behind theirs for up t...