This week on Who Knew? We Didn't! Marta and Meaghan talk about the things that go into making a mass murderer.

Have you ever wondered if any old normal person can be turned into a Ted Bundy or John Wayne Gacy? The answer is.... sort of. It takes a perfect cocktail of trauma and genetics to make someone like that but it's possible. Please don't try this at home.

Note: We are not criminologists, and do not have any sort of expertise in this matter. If you want to let us know something new about this, please chime in!