The Neurobiology of Suicide

Psychiatrist and neuroscientist, John Mann, has a grisly job. He wants to understand why some deeply depressed souls take their own lives, yet others resist. His team's post-mortem studies suggest a distinct neurobiology of suicide. And, for those left behind, might there be a definite 'biology of sadness' too? Also, a bereft father writes to his dead son, and asks 'why?'