ESPN - Head-on collision < 5min

A new book reveals the moment the NFL could no longer ignore concussion science … THERE HAS NEVER been anything like it in the history of modern sports: a public health crisis that emerged from the playing fields of our 21st-century pastime. A small group of research scientists put football under a microscope -- literally. What they found was not the obvious, as many people later would claim. We all knew that football was violent and dangerous, that one hit could break your neck or even kill you. No, what the researchers were saying was that the essence of football -- the unavoidable head banging that occurs on every play, like a woodpecker jackhammering at a tree -- can unleash a cascading series of neurological events that in the end strangles your brain, leaving you unrecognizable. … The researchers who made this discovery -- you could count them on one hand -- thought NFL executives would embrace their findings, if only to make their product safer. That is not what happened.