Every psych and sociology class I've had denies the existence of human instinct (or called them "drives" or some such drivel), but every class and book I've read on biology, chemistry, etc. says that we do have instinct. I'm inclined to side with the latter. As humans, we hold ourselves to such a standard that separates us from the rest of life, like we're something special, exempt from the laws that apply to everything else, which is utterly retarded and big-headed of us.
I hope this thread goes on forever. I'm really fascinated by it.