This is a TED talk I personally am fascinated by, which looks at the math behind cities and corporations. The idea is to see if, through data, there is a theory or math model one can use to predict what will happen to a city and/or corporation. Geoffrey West, a physicist who works on network theory and complex systems, and his colleagues have done this, to see what the behaviors are of human-built entities such as cities and corporations, and how they compare to living systems. There are clear trends, which is a characteristic of a network, and he shows these trends clearly and convincingly. Check it out!