Try to guess which countries have had the most serial killers since 1900.
The Radford University along with the Florida Gulf Coast University has compiled a serial killer database, to help researchers, teachers and law enforcement. The definition of a serial killer used is adopted from an FBI symposium on serial killers in 2005: "The unlawful killing of two more more victims by the same offender(s), in separate events."
The database dates back to 1900. The main page to the Serial Killer Information Center can be found here: http://maamodt.asp.radford.edu/Serial%20Killer%20Information%20Center/Project%20Description.htm