It’s not just a man’s problem. Extensive research in recent years has yielded impressive, albeit disturbing, findings on the correlation between contact sports and concussions. But until now it’s focused almost exclusively on men. New research examining the effects of concussions on female athletes suggests they may be at even greater risk, due to higher physical susceptibility to injury and slower recovery time. Definitive answers are far off, but scientists making a concerted effort to study both genders — whether in mice or MMA fighters — could get ahead of the issue.