Did you know NASA builds robots? Did you know NASA has many ways to explore outer space? Find out more in NASA. They take a story-style approach to each subject: rather than cramming pages with disconnected facts, there are a couple of simple sentences on left-hand pages and one very large, well-chosen photo on the facing page. . . .I think the best book in the series is NASA; it does a good job of explaining how the U.S. explores space, why we send robots to some places and humans to others, and so on.-- "The Planetary Society blog" Martha E. H. Rustad is the author of more than three hundred nonfiction children's books, on topics ranging from baby ducks to black holes to ancient Babylon. She lives with her family in Brainerd, Minnesota.