He wrote 13 books for the [[National Aeronautics and Space Administration]] (NASA), a dozen educational booklets for the [[Atomic Energy Commission]] (AEC), and a dozen articles for the [[National Science Foundation]] (NSF). <ref>Corliss, 2002</ref> | He wrote 13 books for the [[National Aeronautics and Space Administration]] (NASA), a dozen educational booklets for the [[Atomic Energy Commission]] (AEC), and a dozen articles for the [[National Science Foundation]] (NSF). <ref>Corliss, 2002</ref> |