CBC.ca welcomed David Canter, a professor of psychology at the University of Liverpool, on Thurs., May 3, 2007, to answer your questions on terrorism and the motives of the extremists who commit terrorist acts.

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• Download the audio of the interview (Runs 22:00)

Prof. Canter is the director of the Centre for Investigative Psychology and was host of the Faces in Terrorism conference that took place in Liverpool, U.K., last week. He is best known as a pioneer in scientific criminal profiling, and has also done research on people who commit acts of terror.

On Monday, April 23, CBC.ca welcomed Prof. Elliott Leyton to answer your questions on mass murder and the Virginia Tech shootings.

• Download the audio of the interview (Runs 19:46)

Leyton is an anthropologist specializing in serial homicide. He has written or edited 11 books, including Hunting Humans: The Rise of the Modern Multiple Murderer and Sole Survivor: Children Who Murder their Families.