Even though this would be a hard book to pin down to a specific category, the “overview” categorization we’ve given it is no cop-out as it pulls together everything from sociology and political economy to physics, biology and maths. It’s fascinating to learn early on in the book that those who in the 20th century worried about the application of a mathematical technique like statistics to the human populace had got things entirely back-to-front. Statistics originated as a collection of information on people, a crude form of census and developed into a mathematical discipline, rather than the other way round. It’s a big book and it’s necessary to bear with Philip Ball through the rather (aptly?) ponderous chapter on Hobbes’ Leviathan up front, but once he gets into statistical physics he takes off. There’s a lot on economics, on political power, globalization and even the Internet. Again and again the book comes back to the way that mass human action has some resemblances to the...