Robotics: Discover the Science and Technology of the Future with 20 Projects, a book for kids ages 9-12 from Nomad Press, is packed full of information about how robots work and contains "low tech/no tech" projects based on actual robotics research. No special tools or skills are needed to build any of the working robotics models in this book -- just ordinary crafts materials and recycled electronics parts!
Robotics is available from Amazon or can be ordered by your favorite local bookstore. See sample projects and photos and read more about the books on my website Crafts for Learning and my Amazing Robotics Projects Facebook page!