Body language

We can express our opinion not only with a words but also with gestures. Body language refers to various forms of nonverbal communication, wherein a person may reveal clues as to some unspoken intention or feeling through their physical behavior. These behaviors include facial expressions, body posture, gestures, eye movement, touch and the use of space. Body language exists in both animals and humans, but this article focuses on interpretations of human body language. It is also known as kinesiks. As for me, such nonverbal communication is an absorbing phenomenon. That’s why, I like to observe, how people display emotions with the help of gestures. Besides, I try not to make generalizations about somebody’s behaviour. Of course, you may say that it is easier said than done, but I tell the truth.  
There are some type of Body language: 

Aggressive Body Language: Showing physical threat.

Attentive Body Language: Showing real interest.

Bored Body Language: Just not being interested.

Confident Body Language: Appearing assured and comfortable.

Defensive Body Language: Protecting self from attack.

Dominant Body Language: Dominating others.

Emotional Body Language: Identifying feelings.

Open Body Language: Many reasons for being open.

Power Body Language: Demonstrating one's power.

Relaxed Body Language: Comfortable and unstressed.

Romantic Body Language: Showing attraction to others.

Sales Body Language: Using your body to sell.

Trustworthy Body Language: Showing you can be trusted.

Budy language can be very informative, but if you jump to conclusions when you interptet a gesture you must to misinterpret what it means. For example: a clenched fist - shows anger, people who lean towards each other are displaying an interest in each other.

Also there are lot of other expression relates to non verbal communication. You can have butterflies in your stomach or your hart pounding when you are nervous. If you are pulling your hair you must be angry.And you can scratch your head when you are thinking.

Bear in mind that body language varies greatly with people and especially with international cultures, so be very careful when applying Western understanding to Eastern non-verbal language.