We've all encountered at least one narcissist in our lives. They make up 2% of the population. They're typically extroverted and charming. It's not until you've been used and thrown away that you realize their priority is sex, status and stuff. It's all about appearances.

But there's actually multiple types of narcissists. Professor W. Keith Campbell is a psychologist on the forefront of psychopathology research. He explains what our current understanding of narcissistic personality disorder is.

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