The skies are full of amazing aircraft. Some are huge and heavy, making us wonder how they can stay up there! Some are secret spy planes or super-fast jets. Find out about the world's most fascinating aircraft in this book, which includes many photos you might never have seen before. Machinery is everywhere in our modern world and even way out in space. Designed by scientists and engineers, the marvelous machines they have created shape our lifestyles and show us how important technology is for us all.