From the publisher of Nature and Scientific American, Principles of Science is a series of textbooks designed for the world we live in today. The first textbook in the program, Principles of Biology, is a research-oriented, affordable interactive textbook for university-level introductory biology courses.
Wechoosethemoon.org is an interactive experience recreating the historic Apollo 11 mission to the Moon in real time. Once where only three men made the trip, now millions can. Live event begins 9:32 AM EDT July 16, 2009. Exactly 40 years after Apollo 11 lifted off.
National Geographic provides free maps, photos, videos and daily news stories, as well as articles and features about animals, the environment, cultures, history, world music, and travel.