Indeed, very often the thing about good science is that what they discover may seem obvious in retrospect; in this case the notion that in social situations or warfare men treat enemies or strangers differently than friends and family is directly correlated to testosterone levels. Certainly the concept of social cooperation and distinctions are made between different groups of people is not new. However, coming up with data to show a cause for why this is so can be very useful, it can provide a model for making predictions, and can perhaps be applied to other areas of research. I think it's interesting that the video gamer's social interactions through the digital medium were just as 'real' to their bodies as it would have been to someone in a physical setting.