‘“Nobody knew that concussions were potentially serious in 1976, and probably not for the remainder of the ’80s and part of the ’90s. It was thought to be a temporary and mild disruption of brain function that you recovered from and you could get back in there. They called it a ‘bell ringer,’ a ‘ding.’ They didn’t even call it a concussion. Not even neurologists thought they were any kind of a significant injury back then. Doctors didn’t. Scientists didn’t, and that just was the level of knowledge at that time.”’