. >> this is owen thomas's brain and this is a part of the frontal lobe.here are these very dark areas of discoloration in his brain. and when you look at these spots fl is just tremendous ringing around those areas of nerve cells containing this protein. this is very dramatic disease, and what we know from other brains is that if he has lived longer, the disease gradually would have spread out into the neighboring cortex. once the fire is started it goes on its own. >> when the results came through, i can't state was a relief, but it was like, oh, my gosh. there is the reason right there. the fact that they found it in the frontal lobe of his brain that controls impulse control, i think it was a very significant factor. >> i don't think that we know whether the changes that were in his brain, which were quite -- they were definitely abnormal, no question. but whether they explained the ultimate behavior that happened. >> the owen thomas finding was not significant as it related to the cause of death. he could have died in a car accident and the significan

that changes the game to me. >> wrapped up and brought down by owen thomas. >> narrator: because he'dncussion, dr. mckee suspected thomas might have gotten cte from the everyday sub-concussive hits that are an inherent part of the game. >> another nice play by owen thomas. >> those sub-concussive hits, those hits that don't even rise to the level of what we call a concussion, or symptoms, just playing the game can be dangerous. >> the rock is home. a crucial matchup... >> mckee is saying, "look, this is very much an issue at the core of the game, of offensive lineman and defensive linemen pounding the crud out of each other on every single play, on every single down and every single practice, and there's no getting around that." >> narrator: it was a controversial theory that raised fundamental questions about the way the game was played. >> the human body was not created or built to play football. when you have force against force, you're going to have injuries. and i'm not talking about the knees and, you know, all of that stuff is a given. but from a neurological standpoint, you're

owen thomas had never been diagnosed with a concussion. >> we were hopeful that this 21-year-old who'd been playing 12 years, that they would show that, you know, you need more than 12 years to get this disease; you need some more... you need real concussions to get this disease. but owen's case kind of opened up a huge, dark world. >> it was like this could happen to anybody. anybody who's playing this game, this could happen, this could be the result. the question is, when does this start? is this a process that starts much earlier in life than we are used to be thinking about? ( marching band playing ) >> narrator: despite the public discussion about its health risks, more kids play football than any other sport-- over a million across the country. a quarter of the boys at shiloh are on the football team. >> it's another great opportunity this week. we get to play the team that's the number one team in the country. >> narrator: last season, shiloh was invited to compete in one of the premier match-ups in high school football... >> the burger king national kickoff classic... >> narra

thomas hurdle, his first nhl goal. got his first one, how about his second? on the power play. deflects the matt owen shot.he 4-1 victory. 49ers host texans and raiders host san diego at 8:30. i'm mike shumann. have a great day. >> a popular event bound to tie up traffic. coming up, the 13.1-mile block party happening today in well, you've found delicious! ♪ ♪ if you wanna go and fly with me ♪ ♪ it's buzz the bee on your tv ♪ ♪ oh how did i get this way? ♪ hey! must be the honey! ♪ it is so honey swagalish ♪ so much crunch, can you handle this? ♪ ♪ the party in the bowl don't stop! ♪ ♪ hey! must be the honey! ♪ ♪ hey! must be the honey! ♪ must be the honey! too small. too soft. too tasty. [ both laugh ] [ male announcer ] introducing progresso's new creamy alfredo soup. inspired by perfection. [ female announcer ] at 100 calories, not all food choices add up. some are giant. some not so giant. when managing your weight, bigger is always better. ♪ ho ho ho ♪ green giant >> a record 16,000 runners expected in downtown san jose this morning for the rock n' roll half-marathon. the race amounts to a 13-mile blo

thomas hurdle, his first nhl goal through the wickets. got his first one, how about his second? on the power play. deflects the matt owen shot.tory. 49ers host texans and raiders host san diego at 8:30. i'm mike shumann. have a great day. >> coming up, a popular event bound to tie up traffic. the 13.1-mile block party happening now in san jose. mom swaps one of my snacks for a yoplait. i don't mind, i mean it's orange crème. and when mom said bobby was too edgy... 'sup girl. i just swapped him out for tyler. 'sup girl. mom never questioned bobby again. two can play at this game. [ female announcer ] swap one snack a week for a yoplait. and everybody wins. yoplait. it is so good. >> a record 16,000 runners expected in downtown san jose this morning for the rock n' roll half-marathon. the race amounts to a 13-mile block party with live bands performing every mile. this is video from a previous event. finish line is near plaza chavez. there is a post race concert. this year's runners from 14 states and 9 countries are taking part in the run and the fun. >>> a san francisco tradition started by the late supervisor harvey milk hap