BBC地平线：谋杀之谜 

There are about 600 murders each year in the UK. So, what drives people to kill? Are some people born to kill or are they driven to it by circumstances? 　　In this programme, Michael Mosley delves into the BBC archives to chart scientists' progress as they probed the mind of the murderer to try to understand why people kill, and to find out whether by understanding murder we can p...