Principles of Biology--Digital Only!
An interactive graphic in “Principles of Biology,” an electronic textbook from Nature Publishing, teaches students about the symptoms of a stroke.
That’s because the book was designed to be digital-only. Students will pay not for a printed edition at a bookstore, but for permanent access on the Internet ($49).
Check out more interactive digital textbooks...http://www.nytimes.com/2011/12/18/business/online-textbooks-aim-to-make-science-leap-from-the-page.html?scp=1&sq=nature%20textbook&st=Search