Aggressive behavior is exceptionally costly and has inspired decades of research. Over the years, scientists have largely agreed upon the following definition of aggression: "Any intentional attempt ...

It’s a mistake to think problematic aggression is limited to those with psychiatric disorders. Healthy people have also the capacity for impulsive violence – and resulting “morally” poor behaviour.

Some people are directly aggressive, meaning they aren’t afraid to express exactly how they feel. And other people are passive-aggressive. “Passive-aggressive behavior is best described as a pattern ...