People who prefer to work and play at night may have evolved to possess the so-called "Dark Triad" of psychological traits — psychopathy, narcissism, and manipulativeness, a new study suggests.

The theory is often framed as the opposite of the Dark Triad, and hinges on the belief that people are inherently good and should not be treated expediently. The Dark Triad attempts to capture ...

This quiz is for anyone who is curious about their personality and whether they might possess any of the dark triad traits.