In the book "Pistachio theory", Saudi writer and journalist Fahd Amer Al -Ahmadi addresses many topics that address human behavior and how to judge matters and people, as well as ways of human thinking and the process of their development, and provides several important tips that help the person understand himself. "Pistachio theory" simply explains how our chances of life increases thanks to simple changes, and our lives can end within a few seconds due to small errors or sudden fools.