It's rugby fever at the moment with the World Cup taking place but it's worth taking some time to look at the potential and inevitable injuries the sport can cause to its players. Former rugby international John Beattie investigates potential links between the sport and brain injuries. He hears from people inside the industry who have concerns, and travels to the United States to view scientific evidence that a rugby career can damage the brain long term. Leading doctors in the game also explain how the sport is tackling the problem.