You're new here and you've asked what seems to you a reasonable question. You've been down-voted because you haven't done your homework.

From http://ycombinator.com/newsguidelines.html :

    On-Topic: Anything that good hackers would find
              interesting. That includes more than
              hacking and startups. If you had to
              reduce it to a sentence, the answer
              might be: anything that gratifies one's
              intellectual curiosity.

I've re-up-voted you because I don't think your question deserves to be at -4, even though it doesn't really add value to the site.