Passive-aggressive people often say these 11 unnerving things without even realizing how damaging they sound. If you've ever ...

I recently wrote about a surprising finding among American participants: Contrary to all the data on violent crime, playground aggression, and other measures of aggressive behavior, sisters are every ...

Chimpanzees have a reputation for being aggressive, while bonobos are often seen as their peaceful counterparts. This contrast has frequently been used to explain different sides of human nature.