"The people who do use these weapons are often the most dangerous or most sociopathic, " Pollack said.

CNN: STORY HIGHLIGHTS

What the Brazilians didn't know was that the African bees were sociopathic.

FORBES: Global Life

Who foresaw the popularity of boy wizards or sociopathic Scandinavians?

ECONOMIST: How to publish a bestseller

Ledger's Joker was a very different proposition from those that had come before: In a ripped, stained suit, with clown makeup smeared across a scarred, twisted mouth, his Joker was a nihilistic, sociopathic prankster.

CNN: Ledger fans demand the Joker retired from film

For example, we know that the young men who go on murderous rampages are not always sociopathic monsters but, rather, sometimes more or less "regular" men who suffered from crushing depression and suicidal ideation.

CNN: The overwhelming maleness of mass homicide

She was Gogo Yubari, a sociopathic schoolgirl.

ECONOMIST: It's an old folks' home out there