If you’ve looked for a job recently, you’ve probably encountered the personality test. You may also have wondered if it was backed by scientific research.

A study of successful entrepreneurs finds a high level of emotional intelligence and sociability, along with a marked need to dominate.

Do personality quizzes help solidify one's sense of self? Or is there something limiting in having one's identity summed up so neatly?

It’s been noted that Donald Trump has been playing a lot of golf since becoming president. Can his habit be explained by his "sky-high extroversion?"

Did introversion harm Presidents Nixon and Carter's ability to perform on the job?