It's important to realize throughout most courtship processes a woman makes the first move by sending you attraction clusters, and let you know she is initially physically attracted. The difference between the natural and the everyday regular guy is the Natural notices that attraction and capitalizes. It's an interesting and easy approach to courtship.
Just like the other posters said, a simple "what's up?" will suffice. Just enjoy starting a conversation that may not go anywhere, we all start out somewhere, don't expect that you will ever be able to get every woman and certainly don't expect that you will capitalize on every initial attraction. Keep in mind initial attraction is everywhere and doesn't really mean shit. You can see a girl walking down the street and she maybe initially attracted but may be loyally married to some man. It's natural for her to be physically attracted to another man, that doesn't mean she is going to act on it.
Most of the time with women like that I just make eye contact, smile, and say something like "How's it flowing?" or something basic. I tend to use situational openers
http://showyourmind.wordpress.com/2012/ ... fect-open/ based on her body language, the environment, context, but it certainly isn't very difficult to look over at something a woman is holding and ask her about it (like a book since you are at school).
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