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at for more than a year now. growing evidence repeated blows to the head, the kind you get on the football field can have lasting rep recushions. a law take effect in california. a player who gets a concussion must be cleared by a trainer or doctor before going back on the field. the risk is hard to gauge. you can t see damage to the brain unless you actually look inside. of course by then, it s too late. football is a violent game, full of big hits. what are all those collisions doing to the brain inside the helmets? i met with kevin, he s a researcher from the university of north carolina. he can measure the intensity of the hits. a moderate hit and see what happens. it s recorded up here at 23.6 gs of acceleration. he won a grant for his work on concussions in football. he s going to with stand an impact 157 gs. wow. it s similar to a car accident. right. the question is how many of those big impacts can a player with stand over the course of a season orca ....
the head but survives. she was exceedingly lucky, right? when i saw the trajectory of where one hole was and the other hole was, i was like oh, my gosh. however because it was so far apart. it wasn t a little thing it went through a lot. three and a half months later the first public steps in the congresswoman s remarkable recovery. in 2011, i tried to put a spotlight on big hits in the brain finding growing evidence that football puts young people at serious risk and professional players as well. in february former chicago bears safety david duerson committed suicide. he left his brain to research. when it came back it had telltale signs of injury. when stories like this rolled in, the nfl put in new rules to try to protect its players. that was march. i witnessed the aftermath in japan. right here in the middle of the street our first hours on the ground were just scary. so we are going to move at this point. there was no tsunami. we were saved. ....
police are urging folks to stay off their cell phones just in order to keep those networks free so some of the people in the area can call their loved ones, call their family, tell them they re okay. but on top of all this, a person dressed up as a policeman walked into this youth camp attended by 700 people and just opened fire. everything is unfolding as we speak. i want to go to nima. bring us up to speed as far as what s happened. does the number seven fatalities, does that number even still hold? our understanding, brooke, is that death toll will definitely rise. emergency services have said that they still are unable to fully access the buildings around that initial blast. one of the government spokes people said that although today was a national holiday, hundreds of people were in those buildings. and they continue to be trapped in there. they are unable to reach those people as of yet. and on the island, a labor party spokesman, the ruling party in norway sai ....