Shhh! Keep your voice down. Library is not the place suitable for loud conversations, food munching or fist fighting. People come here to educate. Whether they are a professor at a university or a simple young kid recently learned how to read - libraries are open for everyone. Everyone who is able to behave himself, that is. Books, magazines, newspapers - all knowledge known to the world is within library walls, waiting for eager minds brave enough to grasp it.
It is also a good place to hide.