Universal Scaling Laws in Biology, Cities, and Socioeconomic Systems

Cities define the modern world. They characterize the human era and its impacts on our planet. By bringing us together, these "social reactors" amplify the best in us: our creativity, efficiency, wealth, and communal ethos. But they also amplify our worst: the incidence of social crimes, the span of inequality, our vulnerability to epidemics. And built into the physics of the city is an accelerating cycle of crisis and innovation that now drives our global economy and ecosystems closer to the edge of existential peril.