There’s been a spike in children under 19 visiting the emergency room with concussions. ERs saw a more than 50 percent increase between 2001 and 2009. Doctors say this could actually be a good thing, resulting in part from improved awareness of what a concussion is. But, perhaps surprisingly, there’s still a lot we don’t know about concussions, like how long they last or what all the long term effects are. A group of doctors at the University of Alabama at Birmingham who aim to change this.