It seems obvious that anyone who willfully and repeatedly commits murder is a psychopath: remorseless, egotistical, manipulative, and cruel. Think of Ted Bundy, Dennis Rader, or John Wayne Gacy.

According to author Kevin Dutton, psychopaths have a distinct set of personality characteristics. Pictured is Anthony Perkins as Norman Bates in Psycho. Photo by: Mary Evans / UNIVERSAL PICTURES / ...

After a shocking murder, a long line of neighbors, friends, family members, and former classmates often express variations of the same sentiment: He was the nicest guy you’d ever meet. He volunteered ...

The idea that one percent of the human population are psychopaths is both intriguing and unsettling. If true, it means that for every 100 people you pass on the street, one of them might have a ...

Add Yahoo as a preferred source to see more of our stories on Google. When dealing with a psychopath, it can be unnerving to realize just how calculated they can be in choosing their targets. While it ...