"Concussions and Head Injuries in Football - The New York Times." The New York Times - Breaking News, World News & Multimedia. 29 Oct. 2010. Web. 29 Oct. 2010.
http://www.nytimes.com/info/concussions-in-football/
This violent shaking causes the brain cells to become depolarized and fire all their neurotransmitters at once in an unhealthy cascade, flooding the brain with chemicals and deadening certain receptors linked to learning and memory. The results often include confusion, blurred vision, memory loss, nausea and, sometimes, unconsciousness
This website tells you all about concussions. How they happen, and how to prevent them. Also its talks about what they can do to your football career.
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