Spot Father Christmas this Christmas Eve (it's the International Space Station but we won't tell them that).
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FREE eBook - Archaeology, Anthropology, and Interstellar Communication - in mobi, epub & pdf formats
NASA make available thousands of Software Programs and Source Code through Technology Transfer Program
Over 20+ free ebooks from NASA, some in PDF, ePubs and some come as iPad apps. My favorite is this book, Earth is art http://www.nasa.gov/pdf/703154main_earth_art-ebook.pdf