A person does not need to have acquired a doctorate in psychology to determine that there is something horribly different about serial killers. Quotes from assassins show this drastic difference, such as Ted Bundy saying, "What's one less person on the face of the earth anyway?" (Scott 2). Or Charles Manson who, with seven simple words, disgusted and, conversely, inspired millions of people by saying: “Death is the greatest form of love” (“Charles Manson”). It is within these people that it is easy to determine how unstable the very fabrics of their genetic and brain codes are; many things can be passed genetically from parent to child through inheritance; therefore, the same goes for the biological drive to become a killer. Nurture versus nature is a long-standing debate. Nature, also known as pro-heredity in this essay, is about how a person's genetic predispositions are related to behavior and intentions. The monoamine oxidase A (MAO-A) gene has earned the nickname the “warrior gene” because it has been linked to aggression in observational and survey-based studies (Johnson and Tingley). In one actual study, a man named Jim Fallon, who has studied the biological basis of behavior for nearly 20 years, discovered that he had the particular variant, MAO-A, that diminishes the calming effects of serotonin. Fallon not only found out, but also discovered that “one of his direct great-grandfathers…was hanged for killing his mother. That sentence... produced seven more murderers... Lizzy Borden... 'Cousin Lizzy'... was accused... of killing her father and stepmother with an ax...” (Hagerty) . This is surely because this compulsion to kill has been inherited through family lines. Some signs also appear in the brain, as in brain scans...middle of paper...side The Brain of a Psychopath: The Sentencing Debate." NPR. npr, June 30, 2010. Web. March 26, 2014..Monk, Richard Taking a Stand: Conflicting Views on Controversial Issues in Crime and Crimonology. 4th ed a serial killer?". Psychology Today. Sussex Publishers, LLC, April 05, 2013. Web -finding-the-serial-killer-in-the-brain>.Scott, Shirley. "What Makes Serial Killers Tick?"2014. .