CNN has an article up on brain disease in retired professional American Football players. For a time, I worked with a former heavy weight boxer who took one too many punches to the head. Sometimes without provocation (as in you happened to be in the room with him) he would go off and start cursing you and threatening you with physical violence. He eventually did it to a customer, and they fired him. Sad actually, he told me once he poured his whole life into boxing but never was good enough for a title shot. From the article, “In its later stages, CTE can lead to things like rage, aggression, paranoia, and suicidal thoughts.” That is a perfect description of what I witnessed.