You were in a fender-bender on the Long Island Expressway. The ambulance crew said you were fine. You went home. A week later, you still cannot remember names. Your boss asks the same question three times a day. You snap at your kids for no reason. You get headaches every afternoon. That is a traumatic brain injury. Most people call it a concussion. The law calls it a TBI. In New York, these cases are among the most valuable personal injury claims — and the most misunde