When we make decisions in life, we tend to think that we are making wise, rational choices. But this is often not the case. On the contrary, irrationality is the instinct of human beings, and it is the recessive power that truly dominates human behaviors and decision-makings. However, these irrational behaviors are neither random nor meaningless. Instead, they are systematic, predictable and controllable.

"What is happiness?" is a widely discussed topic in human society. Stumbling on Happiness will make you understand, happiness is not only a psychology, but also a science. We came to this world, what the heck is the most important for us? Happiness is the only standard to measure our life, and is the ultimate goal of all targets.