Pilotless Planes or " drones" have become an important aspect of modern military operations. Developed for espionage and warfare, pilotless planes are also used for public safety issues and can reduce injury or death rates for pilots. Glossary, additional resources, and index. Every great invention begins with a great idea. Read all the books in this series and learn about the history and impact of some of the most fascinating innovations and inventions of our time. Explore the idea's early stages of development, problems encountered along the way, and how each great idea has influenced our lives. From popular culture and the environment to life-saving machines, learn about the ideas, people, and technologies that made it all happen. This series correlates with The Science, Technology, Engineering, and Math (S.T.E.M.) curriculum initiative.