Even within each channel, there can be great variation. For instance, not all facial expressions are equally easy to understand. People are generally better at reading facial expressions that are pleasant rather than unpleasant. One study found that individuals are better at accurately interpreting happiness, contentment, and excitement, compared to anger, sadness, fear, and disgust. 
If you’re feeling good about yourself the way you focus your eyes, position your mouth, and maneuver your shoulders, hips, and hands send out signals that say, ‘Check me out! I think you’re hot!’ After you get your target’s attention you shift gears to hold onto his or her interest and move the attraction to another level. Finally, having captured and conquered the unsuspecting, or equally interested party, your body moves into a new mode of behaving that demonstrates comfort, ease, and familiarity. Observe how long-term lovers anticipate one another’s actions by the way they move in synch with their partners.
The 45-degree rule is approximate, and anyway under most circumstances seating angles are influenced by furniture and available space. Importantly, simply try to avoid opposite or side-by-side positions. An angle between these two extremes is best – somewhere in the range of 30-60 degrees if you want to be technical about it.
Stage 1. Eye contact: She looks across the room and spots a man she fancies. She waits till he notices her then holds his gaze for about five seconds and then turns away. He now keeps watching her to see if she does it again. A woman needs to deliver this gaze, on average, three times before the average man realizes what’s happening. This gaze process can be repeated several times and is the start of the flirting process.
Women tend to use a higher vocal pitch when they are interested in a potential romantic partner. Their voices get higher in acoustical tone, not in volume, when they find an attractive mate. By changing the pitch of her voice, a woman is signaling her feminine traits to the object of her affection.
Noticing the signs of attraction that are hidden in body language can instantly tell you if a guy likes you or not. Reading a man’s body includes looking at the way he carries himself, the movement of his eyes, the stiffness in his posture and some of the other obvious signs of passive flirting.
If you’re constantly playing a game of footsie with a guy, that’s one of the biggest signs that he is interested in you! After all, if a man doesn’t like a woman, he will never show any sign that he is interested in her.
Slouched shoulders: When a man who has a normally broad shouldered stance suddenly slouches, even slightly, it means whatever you have just said or done is incredibly endearing to him. The shoulder slouch means he’s getting ready to hold you. His emotions for you are strong.
Have you noticed one guy who stares at you, but when he sees you noticing him, he turns away? Then when you turn to look at him later, he’s already staring back at you? If it happens more than once, there’s a good reason for it and most likely he likes you.
There are numerous studies that support both the cultural equivalence model and the cultural advantage model, but reviewing the literature indicates that there is a general consensus that seven emotions are universally recognized, regardless of cultural background: happiness, surprise, fear, anger, contempt, disgust, and sadness.
crossed arms (folded arms) arms defensiveness, reluctance Crossed arms represent a protective or separating barrier. This can be due to various causes, ranging from severe animosity or concern to mild boredom or being too tired to be interested and attentive. Crossed arms is a commonly exhibited signal by subordinates feeling threatened by bosses and figures of authority. N.B. People also cross arms when they are feeling cold, so be careful not to misread this signal.
Proxemics – the technical term for the personal space aspect of body language. The word and much of the fundamental theory was devised by Edward Twitchell Hall, an American anthropologist in the late 1950s and early 1960s. The word is Hall’s adaptation of the word proximity, meaning closeness or nearness.
First, he’s action like any other guy who likes a girl. Second, this situation is more complex than usual. With him being a manager at your job, there’s an extra taboo there and clearly he’s afraid to cross that line. You need a guy who’s confident enough that he likes you do do something about, manager or not. So keep your options open. Once he’s ready he’ll make a move.
head shaking of the head generally indicates disagreement, but can also signal feelings of disbelief, frustration or exasperation. Obvious of course, but often ignored or missed where the movement is small, especially in groups seemingly reacting in silent acceptance.
A nervous man cannot hide his signs of attraction as he loses control of his movements. You will see him walking uncontrollably with a restless leg syndrome. He constantly fidgets with his fingers because your presence simply blows out his mind and he can’t think straight.