Our brains evolved to solve the survival problems of our Stone Age ancestors, so when faced with modern day situations that are less extreme, they often encounter a mismatch. If you've ever felt an anxious fight or flight response to a business meeting, equivalent to facing imminent death by sabre-toothed tiger, then you have experienced it. Ronald Giphart and Mark van Vugt show that these mismatch conflicts can have profound consequences, manifesting itself in the popularity of Facebook and internet porn, the desire for cosmetic surgery, to our attitudes towards refugees.