I love science, and it pains me to think that so many are terrified of the subject or feel that choosing science means you cannot also choose compassion, or the arts, or be awed by nature. Science is not meant to cure us of mystery, but to reinvent and reinvigorate it.
If a rat is a good model for your emotional life, you're in big trouble.
Depression is not generalized pessimism, but pessimism specific to the effects of one's own skilled action.