a digital library of Internet sites and other cultural artifacts in digital form. Like a paper library, we provide free access to researchers, historians, scholars, and the general public.
This site provides a free physics textbook that tells the story of how it became possible, after 2500 years of exploration, to answer such questions. The book is written for the curious: it is entertaining, surprising and challenging on every page.
the home for language courses developed by the Foreign Service Institute. These courses were developed by the United States government and are in the public domain. This site is not affiliated in any way with any government entity; it is an independent, non-profit effort to foster the learning of worldwide languages.