Dr. James Fallon is a neuroscientist, biologist, professor at UC Irvine, the founder of a stem cell research company, and author, who discovered one day as he was examining the brain scans of criminals that he had the brain of a psychopath.  He’s since given a Ted Talk (link) on the subject that’s been viewed over two million times, and I reached out recently to see if he wanted to talk. Our conversation ranged from Putin's brain to how violence passes through generations.