This is a video I found on TED talk. It is a neurologist talking about concussions and the impact they have on kids. This stood out to me because of the comparisons they made and how much more force football puts on the brain than even a car crash.

https://www.ted.com/talks/kim_gorgens_protecting_the_brain_against_concussion#t-208329

1:50-3:30 is a g portion of the video talking about the forces and consequences of a concussion in athletes.