Here in Erie County, we're blessed with a really interesting NASA facility — NASA Plum Brook Station. It has the world's biggest indoor vacuum chamber, used for testing how space will affect rocket equipment.
NASA makes a lot of its discoveries available on its websites. I've been downloading its astronomical images for years, for computer wallpaper and other uses.
But I didn't realize until just the other day that NASA also offers free ebooks. I only found out when Boing Boing, the very popular blog, posted an item on one of NASA's new ebooks, "Archeology, Anthropology and Interstellar Communication," edited by Douglas Vakoch. I promptly downloaded a copy for my Kindle. It's all about how to communicate with aliens from other star systems.
If you go here, you'll see a list of other NASA ebooks. There are all kinds of goodies here, including a history of the Russian space program translated from the Russian, and books for teachers. Many of the books are in different formats, including EPUB (for the Nook) and MOBI (for the Kindle.)