[no audio] they also have people who describe themselves as being more satisfied with their lives and their jobs. cities are the pass of out of poverty into prosperity for so many of the world. we ve seen the success of places like new york, not just in terms of their income. cities are also fun, green, healthy. they are exciting places to be where the magic of human interactions tends to make place just so much more exciting. now if you the idea behind this book, the reason to claim that the book makes for why cities come back is that cities play to mankind to human kinds greatest asset. which is our ability to learn from people around us. we come out of the womb with the remarkable ability to learn from our parents withing from our peers, from sibling, from people around us that are doing things that are really smart from people around us who are screwing up. cities make that happen. they are the obvious sense of space between people, proximity, closeness, coming to the