@CNN: Their brains were developing normally. None had ever had a concussion. But by the end of a single football season, 24 kids between the ages of 9 and 18 who had more frequent impacts to the head showed signs of damage to brain development, new research says https://t.co/LcAWmLjImm

@CNN: Their brains were developing normally. None had ever had a concussion. But by the end of a single football season, 24 kids between the ages of 9 and 18 who had more frequent impacts to the head showed signs of damage to brain development, new research says https://t.co/LcAWmLjImm