CNN reports a recall of various GM cars with common 3.8 liter engines due to potential fire hazards.

From a Brain Injury Lawyer-Concussions Are Brain Injuries Often Misunderstood
Concussions occur as a result of excessive force to the brain within the skull. Some people believe you need to have contact of the head with a hard object to have a concussion. However, a concussion or brain injury can occur without the head contacting any hard object.

