A look at the notion of size and how it determines the world around us. To answer the most important questions of our age, and secure our future, we must understand size. Neither bacteria nor empires are immune to its laws. Measuring it is challenging, especially where complex systems like economies are concerned, yet mastering it offers rich rewards. Grounded in history and drawing on the latest science, with much recourse to art and classic literature, SIZE explains the regularities - and peculiarities - of the key processes shaping life (from microbes to whales), the Earth (from asteroids to volcanic eruptions), technical advances (from architecture to transportation), and societies and economies (from cities to wages)