A head injury is defined generally as trauma to the cranium (skull), scalp, or the brain. The two basic categories of traumatic head injury are open head injuries, in which the skull is broken or pierced, or closed head injuries, in which the skull remains closed/unbroken.

School is starting up again throughout Texas and the rest of the nation. For U.S. school kids, this means a return to carrying heavy backpacks — and the sore backs and posture problems that result.