"A concussion is a brain injury caused by a bump or blow to the head that can change the way your brain normally works. Even what seems to be a mild bump or blow to the head can be serious. As a coach or youth sports administrator, you play a vital role in sharing this information with athletes and parents. You are on the front line in the effort to identify and respond to concussions in young athletes." - US Department of Health and Human Services, Centers for Disease Control