Adolescence is the important transition period from a little dependent kid to an independent adult. Many people believe that teenager’s brain only grow bigger in this period, however, the teenager’s brain is neither an “older” little kid’s brain, nor a half mature adult brain (Giedd, 2008). In fact, a teenager’s brain is developing at one of the most complex stages in their lifetime. The period of puberty also is defined as the most troublesome time. When people talk about teenagers, they always connect them with words like adventure, trouble-maker, aggressiveness, self-centeredness, or radicalness, etc.…