What I want to know about my topic.

I would actually like to know a lot about psychology. I would like to know why we dream, what effects the kind of dream we have, and what our dreams mean if they even mean anything. I want to know what makes someone your "friend". Like, why traits attract someone to want to talk to you and become closer to you. I want to know why we are afraid of the things we are afraid of and just basic stuff like that.