Helmets measure the hard hits

When UNC football player Melik Brown smacked head-first into a Utah player last season, he rocked his brain with the same force as a car hitting a brick wall at 25 mph. He got a headache. He started seeing double. And six dime-size sensors in his helmet measured the exact force of the blow. In years past, athletic trainers could depend only on physical tests to determine whether a player had a concussion and how long he should sit out. But because the Tar Heels are part of a five-year study using those sensors, the doctors' job was easier. They made Brown sit out two more games. (Raleigh News & Observer)