" In 2009, for the first time in history, more than half the world’s population lived in cities. In a time when family, friends and co-workers are a call, text, or email away, 3.3 billion people on this planet still choose to crowd together in skyscrapers, high-rises, subways and buses. Not too long ago, it looked like our cities were dying, but in fact they boldly threw themselves into the information age, adapting and evolving to become the gateways to a globalised and interconnected world. Now more than ever, the well-being of human society depends upon our knowledge of how the city lives and breathes. "

― Edward L. Glaeser , Triumph of the City: How Our Greatest Invention Makes Us Richer, Smarter, Greener, Healthier and Happier