So I've recently been interested in this girl who is in my chem and physics lab. I'm not her partner, but her lab bench is across from mine. I rarely get a chance to talk to her since labs are so busy, and I usually finish sooner than her. I did get to start a short conversation one day after physics lab. We finished at the same time, so we got to talking for a few minutes before our paths separated. I'm assuming she recognizes me now, but I need help on how to go from "hello" to "lets grab a bite to eat together." What's a good way to do this? I rarely see her outside of lab.