Because most of the questions asked here could be answered in TWO F*CKING SECONDS if the OP would friggin pull his head out of his ass and do his own damn dirty work. It's not that hard to google the basic concept of what you're interested in, trying to find an answer. Hell, that's even better than just posting a question and sitting around waiting, hoping someone else will answer it.
That's forming bad habbits. Nip that sh*t in the butt. Get off your ass. Be proactive. Do something for yourself instead of waiting around for someone else to do everything for you.
</lame rant>