Science shows a correlation between happiness and health, success and fulfillment. But do they make us happy? Or are we healthy and wealthy because we are happy?

Stress: Nobody likes it, but exactly what does it do to the brain? New study shows altered blood flow during stress.

Stress can interfere with working memory and judgment by changing a chemical messenger. What is the role of stress in bipolar disorder and schizophrenia?

Preacher, politicians: Some have a truthiness problem. Human lie detectors use close observation and wide experience to spot clues. How?

With autism rates on the rise, researchers are trying to uncover the biological keys to the disorder.

Study of tribe in South America shows that using a language without numbers degrades ability to count.

Why are John F. Kennedy, Ronald Reagan and Winston Churchill considered charismatic? Is charisma always good? (hint: think Adolf Hitler)

Marriage confers a wide range of economic, social and psychological benefits. What does marriage do to kids? To adults? What should we make of the high divorce rate? This article could change your mind!

Baboon mothers with more social ties have better infant survival. Talk about the evolutionary advantage of communication!

In mid-2004, U.S. jails and prisons held 2.1 million people. What are the psychological effects of imprisonment? How do POWs survive prison and torture? Can these scars be healed?