I recently watched a documentary on concussions.  I don't know who the author or director was unfortunately.  I chose to watch this documentary out of pure boredom and it seemed interesting.  The entire documentary was about concussions and the affects of them on your health in the years to come.  They told us how concussions actually kill brain cells and create a plaque of sorts on the brain.  After years of this plaque build up it actually starts to affect you mentally.  It can cause severe depression and drive you insane and can possibly lead to you committing suicide.  But unfortunately no one can give you a definition of what a concussion is.  It can be what i always thought it was when you knocked yourself out, don't remember it and you pupils are extremely dilated, or it can be anytime you hit your head and hear a ringing noise, see stars or something like that.  So this means no-one can know exactly how many concussions they have.  This directly relates to my life because i have always thought i have had 5 concussions, like to where i blacked out and don't remember, but this documentary says i could have way more.  I watch stuff like this occasionally, but i dont normally watch tv.  I feel like this could be criticized because some of it was very vague, like there not actually being a definition for what a concussion is.  But they argued their points very well and provided evidence to back it up.