"A basic introduction to rockets and how they work, focusing on the history of rockets, the important parts of a rocket, the ways rockets have been used for space exploration, and improvements to rocket designs"--.
"The first helicopter was built in 1936. Helicopters use spinning rotors to create lift. They are used in a variety of jobs, from search and rescue to reporting on traffic. Discover the history, design, and features of these . . . . flying machines"--.
"Fighter jets were invented in the 1930s. Their design helps them fly fast and make sharp turns. Today's fighter jets are almost invisible to radar. Discover the history, design, and features of these . . . flying machines "--.
