**grins sheepishly**
I was sent to a psychologist for my learning difficulties in school, and he discovered at that point that I'm academically a genius.
Not only do I lack common sense, but I lack virtually every other mental sense out there. I've got conceptual understanding. It's like one of those video games where you dish out a set number of points to different attributes.
I gave every last point to conceptual understanding. No social sense, common sense, memorization, visualization, nadda. But I do damn well in chemistry class.
**smiles** On a more serious note, I'm very sensible in very specific circumstances. Virtually all of my interactions with people, things, books, etc, are purely analytical, logical... all mental. Thus, things like college classrooms (as opposed to the more social-based elementary school) I excell in, whereas social situations I fail. There are simply too many variables to understand in a timely fashion. I'm not permitted even 30 seconds to process the possible meanings of a person's statement. In order to be social, my response needs to be instantaneous. Yet, for any given statement, coupled with different body reactions, it could mean hundreds of things. I try to analyze each possibility to see what is the most probable... but as you can imagine, I either A take too long and look like an idiot, B hastily go with my first impression (which is literally random) and 90% of the time be wrong, or C devote 100% of my mental ability to analyzing their reactions as quickly as possible. Which means, I'm barely decent at judging them, but then stammer, say bizarre things, and just sound idiotic.
In short? People think in different ways, some of which cannot adapt to "normal" human behaviour.