Head injuries resulting in concussions can be traumatic and dangerous for any person, but a recent study shows that they have a prolonged effect on children under the age of 13. Researchers from the New York Institute of Technology College of Osteopathic Medicine have found evidence that concussion symptoms last three times longer in these young children than they do in older teens and adults. Moreover, they say that keeping affected children out of school may not be the best course of action.