Living with a 'borrowed brain'

I am not in the NFL nor do I play contact sports. I am 28, and on February 19, 2012, I happened to be in the wrong place at the wrong time.

Source: http://rss.cnn.com/~r/rss/cnn_health/~3/0k0tLMjXYFw/index.html

as example as an example explained here as explained here