Personality

The way your Facebook profile looks may suggest a lot about your personality, a new study finds. Researchers compared how extroverts and neurotics behave on the popular social networking site.

On long-term space missions, such as missions to Mars, having an extrovert on board could have several disadvantages, a new study suggests.

"Dog people" and "cat people" really do have different personalities, according to a new study.

A new study finds that firstborns are more conservative than their younger siblings, lending support to the controversial idea that birth order might influence personality in the long run.

Chimpanzees not only possess many of the same personality traits as humans — from agreeableness to extroversion — these traits are structured almost identically in both humans and chimps.

Certain female spiders are infamous for eating their partners after sex, but some actually pounce on suitors, fangs first, before mating ever occurs.

A young adult's personality may hold clues to his or her health later in life, so perhaps doctors should assess their patients' personalities during checkups, a new study says.

First impressions are often accurate, but even when they aren't, it's hard to overcome snap judgments based on people's faces, two new studies find.