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And that doctor may disagree and say, no, dr. manny, i think we keep the patient on observation and see what happens in the next two or three hours. there's no more brain injuries in europe than there are here in the united states. we have a lot of overutilization, we have scared parents, i know, i'm a father, when a kid falling down, you have to be very careful, but it clearly shows that overutilization of cat scan may not be necessary, especially in the pediatric population. so i like it. jenna: okay. i'll try not to fall off this chair. good thing we have you here in case. >> i'll give you ...

>> think about every day what do you usually have on you no matter what you're doing? when you're traveling, at work, at home, by your bed, what do you have? most of us have a cell phone that in a situation where an emergency's taking place may be the best way to get hold of you. and we need to adapt to what the public is using, not make them fit traditional systems. >> reporter: officials used 9/11 as an example, also that terror bomb threat in new york's times square last year. if and when these kinds of incidents occur, the messages would go out to people in that region. to warn them about ...

You do that. several houses here on ford street, the roofs or houses completely underwater here. the water has risen an additional foot just in the past 24 hours. the real concern here, officials say, are a lot of areas which have never been flooded before are getting flooded now, so some of the people not taking the warnings, the cautions really as seriously as they need to. water is expected to keep rising here for another nine days. jenna: steve hairy michigan, thank you very much for that live report. jon: nato is stepping up air strikes across libya. it's been hitting key targets in tripo...

Jenna: well, the doctor is in. when children go to the emergency room with head injuries, nearly half of those children undergo cat scans, according to the cdc, centers for disease control. but new information suggests it may be better to wait before getting a scan. a little counterintuitive for a lot of parents listening to this. dr. manny alvarez, senior managing editor of foxnewshealth.com. why is it better to wait? >> it's not that it's better to wait, a lot of kids are getting a lot of unnecessary ct scans which is an argument that a lot of doctors always make. patients get panicked, they...

Okayed. that's tear gas floating in the air. riot police used that, as well as water canyons -- at sthows of demonstrators, i shall say, blocking the streets of santiago, some throwing rockings at cars carrying commissioners who gave the green light to this $7 billion dam project, aimed at blocking two of the world's wildest rivers to produce electricity. jenna: right now, let's head state side, where the president is headed for el paso, texas. he's going to be making a big speech on immigration today. it could be important to shoring up the hispanic vote. certainly all about politics. and her...