The tendency to synchronize is one of the most far-reaching drives in the universe, extending from people to plants, animals to atoms. Here Steven Strogatz, leading researcher in chaos-and-complexity theory, explores the deep connection that links these phenomena- the mathematical theory of self-organization, where millions of simultaneous interactions result in order emerging from chaos. Sync tells the story of this dazzling harmony - the cycles and patterns that fit together like clockwork to affect our lives at every level.