Ideas, experiences, clinical observations, and technology are changing so rapidly that a static book is quickly outdated. Books with long-term value have always been republished as new "editions". Books create value as a one-stop-shop on a specific area by organizing and synthesizing a sea of information from myriad sources. In this scenario, a book is still an organized body of knowledge on an area shaped by the authorīs vision, perspective and expertise, the continuously developing research, and the continuously published literature. It is a living, breathing, adaptable entity, able to respond to its readers and incorporate new thoughts as they are born. Rather than buying a book, you subscribe to it: you get the always current edition, access to reader-only forums in which the authors and readers actively participate, and a "feed" of continuous content updates.
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