OUR world is dictated by systems far more complex than any one of us can see. A financial market, for example, is not just numbers on a screen. It is billions of individual decisions, buyers and sellers interacting with one another in ways that are anything but linear.A tiny policy change in one corner of the world can trigger a chain reaction across industries, economies, and entire continents. Climate, supply chains, social networks, the complex systems that shape our lives all share the same structure. T ...