This book, written by Edward Glaeser in 2011, explains why the city is our greatest invention. As a new resident of New York City, hailing from a mid-western city of 30,000; this book offered great insight into myths I was brought up believing, and re-affirmed all the reasons why I came to NYC. This book is one interesting fact after another, a fast read, and will never let you think about cities in the same way. I recommend it to everyone.
Find it on amazon here