Welcome to the lab of Professor X. Ploder as his assistant on a top secret assignment to design and test a spy's rocket. Discover all about the science of rockets through practical experiments that you can try at home. Level 3 books, designed for children who can read on their own, contain more complex sentence structure and more detail. Information boxes highlight historical references, trivia, pronunciation, and other facts about words and names mentioned. DK Readers combine an enticing visual layout with high-interest, easy-to-read stories to captivate and delight young bookworms who are just getting started. Written by leading children's authors and compiled in consultation with literacy experts, these engaging books build reader confidence along with a lifelong appreciation for nonfiction, classic stories, and biographies.