Summarize this article in one sentence.
If a girl looks down when she first sees you, or if she lowers her head while smiling, it's a strong indicator that she's attracted to you. It can be hard to look someone in the eye when you have strong feelings that are not yet exposed. Triangulation describes a pattern of eye movement that is a strong indicator that a girl is into you. She will look at one eye, then the other, then your mouth, and then repeat the sequence. Playing with hair causes blood to flow and makes you feel connected with your body, so if you notice a girl twirling hair, it's a positive sign. If a girl leans in close to you, makes an excuse to touch you, or lets each touch linger for a longer period of time, then she may see you as more than a friend. If she touches your shoulder, brushes your hand, or hugs you for no real reason, it is a positive indication she likes you. If a girl wants to share a drink or food with you, chances are she is way into you. If a girl has a large smile every time you two have a conversation, and laughs nonstop, then she thoroughly enjoys your company. This is an unconscious way of saying, "I really like you, and I love listening to you talk". When in love, you see that person through rose-colored glasses, making everything that person says seem perfect and funny.
Look for eye contact. Watch for hair twirling. Pay attention to body language. Notice if she laughs at your jokes, even when they are not funny.