To find out, we asked James Fallon, a neuroscientist at the University of California at Irvine School of Medicine who specializes in studying psychopaths (and also happens to be one himself).

We posed this question to James Fallon, a neuroscientist at the UC Irvine School of Medicine who specializes in studying psychopaths and just so happens to be one (but that's another story).

So what's the difference, you ask? To find out, we asked James Fallon, a neuroscientist at the University of California Irvine School of Medicine who specializes in studying psychopaths (and also ...