The most famous work by the classic psychologist Leon Festinger in a modern presentation. The concept of “cognitive dissonance” has become firmly embedded in our lives—this psychological phenomenon influences our behavior and how we perceive the world. People strive for inner balance between the information they receive and the personal motives behind their actions—sometimes even against common sense. The desire to reduce dissonance is a vital need in anyone’s life—author proves this with the results of numerous experiments and surprising historical facts.