What makes a killer? Is it nature or nurture? Not until Jack The Ripper and HH Holmes did the public even recognize the proclivity to kill in mass.
We know it must have been a psychological need to kill throughout history but only in modern times has the human race begun to study and tear apart psychology.
Our questions today are: does culture and nurture change how people kill and more?
Linda Sage is an expert on the psychology of serial killers and joins us today.