If you've ever had to grit your teeth during rush hour traffic or hold your tongue in a work meeting, you know just how pervasive feelings of aggression can be. We've all been there. Anger is one of ...

Human history is marked by war, conflict, and violence. From ancient tribal battles to modern political tensions, aggression has shaped our species. It is not confined to warfare; it appears in sports ...

Did your sister ever hit you, kick you, or yell at you? Did you ever hit, kick, or yell at her? What about your brother? According to a study published in Evolution and Human Behavior, sibling ...