§16§The book begins with familiar designs found all around and inside us (such as the 'trees' of river basins, human lungs, blood and city traffic). It then shows how all flow systems are driven by power from natural engines everywhere, and how they are endlessly shaped because of freedom. Finally, Professor Bejan explains how people, like everything else that moves on earth, are driven by power derived from our "engines" that consume fuel and food, and that our movement dissipates the power completely and changes constantly for greater access, economies of scale, efficiency, innovation and life. Written for wide audiences of all ages, including readers interested in science, patterns in nature, similarity and non-uniformity, history and the future, and those just interested in having fun with ideas, the book shows how many "design change" concepts acquire a solid scientific footing and how they exist with the evolution of nature, society, technology and science.§ §04§Preface.- Nature and power.- Economies of scale.- Hierarchy.- Inequality.- Social organization and innovation.- Complexity.- Discipline.- Diversity.- Evolution.- Diminishing returns.- Science and freedom.- Acknowledgements. §02§Adrian Bejan was awarded the Benjamin Franklin Medal for "Thermodynamics and constructal theory, which predicts natural design and its evolution in engineering, scientific, and social systems". §02§eatlines, temperature-heat (T-Q) drawings, and many more. He has received the highest international awards for thermal sciences, and is a member of the Academy of Europe.