Re:How the hell... (Score 2, Interesting)

Well, I'm wondering if uprooting depression completely is a good idea. Does depression have a darwinian advantage? Will the ever-happy mouse always remain cheerful and lose the fear trait also, and thus not feel shivers running down its spine upon the sight of a cat. Are there any links between fear and depression? Fear definitely has a well-established darwinian advantage. Have we, as humans, evolved to a stage when fear offers no significant survival advantage?