The key to understanding people and the world around us begins with education. One way to learn about the world is by developing a love of books. Each month, we profile a library. Large, small, urban, rural, post-modern, quaint or neo-classic; do you have a library that you love? Tell us about it. This month, Patricia Vaccarino writes about the granddaddy of all libraries on 42nd Street and 5th Avenue in New York City.