examined mike's brain and then discovers he has this neurological, neurodegenerative disease, the first in a football player. that is really the launching point for the concussion crisis in the nfl. >> of course, the nfl is putting out the opposite information at the time. you write in your book, this moment in the book made me mad, the nfl, rolling out numerous scientific studies all getting printed in this medical journal, the head of the traumatic brain injury committee, who wrote in this journal "neurosurgery" regarding brain injuries, quote, this injury has not been observed in professional football. how could he write that and how could that medical journal publish it? >> well, i think what's so striking is that you have parallel narratives going on at the time. you have on the one hand a growing body of as many as a dozen neuroscientists, many of whom were affiliated with the nfl or loved professional