We were told that rational thinking is the key to success. But modern scientific research proves that emotions are no less important. Every day we make hundreds of decisions - what to eat for breakfast, where to invest and with whom to communicate - and the role of feelings in making the right decisions is enormous. About the role of emotionality - a new book by Leonard Mlodinov, an American physicist and scientist, professor at the California Institute of Technology, a specialist in quantum theory and chaos theory, as well as a successful popularizer of science. He easily and humorously explains dry scientific facts. The book is a fascinating study of the evolution of feelings, which convincingly demonstrates that emotions do not deprive us of clarity of thought at all, but, on the contrary, enrich our lives. The author shares knowledge about the nature of motivation and the causes of motivational disorders, including addictions. It helps to recognize the true causes of fears, anxiety and frustration, improve communication skills and effectively communicate with other people. He shows how to make feelings his allies and helpers.