For years people have speculated that the reason we choose friends is because they think similarly to us. Scientists have recently conducted a series of brain studies to get at this question. By examining the brain activity of close friends watching the same video researchers have found that regions in their brain behave in similar ways. These researchers argue that we unknowingly pick people with similar brain waves to help process information easier and communicate better. Thus, the old age proverb “birds of a feather flock together” proves true.