Psychology is a practical science to help people learn about themselves, discern life, and interpret behavior. Kaleidoscopic human mentality is a rather complicated and fantastic field in psychology. Numerous experiments reveal that there is law in human mental activities. In fact, people are quite familiar with these mental activities; they feel mysterious only because they dont have a scientific understanding of them. Yet the strict and abstruse psychology is obscure for the ordinary public. Therefore, an appropriate thread is in urgent need to put psychology into practical use in our daily lifethis book meets this need.