Free iBooks from NASA - Hubble Space Telescope: Discoveries & Webb Space Telescope: Science Guide
No matter what your age, there is always something to learn. At the time of this writing, NASA has made two of its iBooks free to download from iTunes. If you don’t have an iPad, you can also download a PDF version. These books are designed with entertainment and education in mind. They are designed to be highly interactive and you’ll have to try harder falling asleep while reading them. I have a first generation iPad, but even so the pictures are delivered with HD clarity. Overall, its well done and a must have while it is free. So, go download it today.
Here is a quick walkthrough of one of the iBooks: