For decades, some watchdog organizations and former NFL players have warned about the possible long-term effects of sustained concussions suffered by professional football players. This recent documentary from Frontline looks closely into this situation by interviewing players, scientists, family members, and others with an interest in the subject. Users can watch the entire program here and they will definitely want to look at some of the bonus features as well. These include a detailed timeline, commentary from current NFL players including Tom Brady, and additional interviews with experts about the science of concussions. It's an engaging program and one that will be of interest to journalists, sports fans, and anyone with an interest in physiology.