omalu: nobody has ever reached out to me., what they have done is that they have gone on doing a smear campaign to delegitimize me, sometimes very racist. every time they mention my name, theyay, he's nigerian-born, so that people in the subconscious would begin to associate with the scam emails you get from nigeria. so, it's a shame, in my opinion. but again, it doesn't bother me. it doesn't really bother me. i still have to speak my truth, and help save lives. geoff: dr. omalu also says that tua should retire from the league. dr. omalu: with the two documented concussions, he must have suffered thousands of repetitive impacts to his head. now, remember, the brain is not like the liver. the liver, you damage it, it regenerates. the brain doesn't do that. the injury is permanent. and there was a reasonable probability that at some point the damage becomes progressive and becomes a neurodegenerative disease. my advice would be that it's time to hang up your helmet. sometimes the stronger person, and the smarter person, is he w

bennet omalu.early work on the brain condition nonas cte in a former nfl player in the movie "concussion" tells the doctor's story. dr. omalu, thanks very much for being here. good to have you with us here today. >> thanks, martha, for having me. >> martha: so the nfl is saying while the investigation determined the team medical staff and medical professionals followed the protocol as written, the nfl and the player's union agree the outcome in that case putting hit back in the game is not what was intended when the protocols were drafted. specifically the term ataxia has been added to the mandatory no-go symptoms. what is ataxia and what is your opinion of this change in the rules? >> well, ataxia is the medical terminology for imbalance. ability to stand firm and walk straight. but having said that, when i heard about the nfl new update, after that was criminally negligent of the nfl, martha, we've always known that imbalance and ataxia is symptoms and a sign of a concussion. so if that did not h

omalu: my strong advice to him would be to hang his helmet, and cherish his life.: and climate change in alaska. how warming waters are decimating salmon populations and forcing native people to change their way of life.