violent crimes nonmurder, but with guns, have plummeted 75%. so as we arm ourselves in america, our violent crime rate is plummeting therefore the reality is more guns means a safer america. >> that's flawed logic. you think a different society you don't think anything but guns is the reason for that? >> but this is what is called a hate fact. a fact that you hate. but there is a lot of research looking at specific gun roll laws and they find that permits are the only way that -- or that are correlated to reduced crime. >> you regulate it you have it identified, you know who has what guns where and you have certain standards and practices. >> and there is a great article coming out in the "chicago sun-times" that talks about how people like elliott roger, who was a street killer, he actively looked at santa barbara where there was a place where there weren't any guns. he worried about being shot. so that's what terrorists do. >> of course. so that's why they go to places that they think are soft targets. whether movie theaters or schools or eve

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crimes and there are more than 100 juveniles like terrence graham serving life without parole for nonmurders. in the brief time we have left the chapter on sports and concussions. you describe in there what happens to the brain when you're playing football or you get your head knocked in a wrestling match or whatever. did you have a son that was an athlete? >> they both were. wrestlers and then one also played football. >> what happens to the brain when there's -- what degree is there when it comes to this concussion? what does it take to have a concussion? >> well, a concussion is a rapid, can be caused by a rapid impact to the brain, i mean to the skull, which causes the brain to sort of shift inside the bony capsule called the skull. our brains though are more like jello and so it doesn't require you fracturing your skull to cause damage inside the brain. and so it will shift back and forth and it hits the inside walls of the skull and can have some shear injuries because the structure can be torn as it's shifting back and forth. with severe brain injury or even moderate brain injury we s