The most common form of brain damage is a concussion, which is defined by braininjury.com as a sudden trauma-induced alteration of the alert state. Also given on the website is an explanation about how a concussion is caused by the impact of a force. Typically, when a human is hit head on, such as a linebacker tackling a running back with a shoulder to the head, there is initial impact that is very visible. This impact is the initial, or primary, impact, and involves the brain being smacked against the frontal bone of the skull. However, what is typically not seen or noticed by the common person is something known as the secondary impact.…