Science Nov 07 Genetic genealogy can help solve cold cases. It can also accuse the wrong person. By Nsikan Akpan
Politics Apr 17 Watch Experts Explore the Mind and Motivation of a Mass Killer The 23-year old Virginia Tech gunman, Cho Seung-Hui, has been described as a troubled loner. A clinical psychologist and a behavior analyst discuss the profiles of people who commit major crimes.