Students read about the two types of flight—gliding flight and true flight. They learn about both lighter-than-air flight and heavier-than-air flight and about different types of fl ying machines, from parachutes and airships to jets and spacecraft. They find out about the forces at work in flight and how Bernoulli’s principle explains lift. They are also introduced to the Wright brothers, who made the airplane that flew the first powered, controlled flight. Finally, students learn about milestones in the history of flight.