01:00
Serotonin and Violence
Dean Hamer, Director of the Gene Structure and Regulation Unit at the National Cancer Institute, continues his comments about serotonin. Dr. Hamer explains that in addition to making people feel depressed, serotonin seems to also trigger hostility i...
01:14
Nature vs. Nurture (Part Two)
Dean Hamer, Director of the Gene Structure and Regulation Unit at the National Cancer Institute, talks about studies that suggest the combination of a genetic predisposition towards violence, coupled with a bad home environment, is a toxic mixture t...