The fact "When an airfoil is moved through the air, it is capable of producing lift" is illustrated with the story:1. Orivlle and Wilbur Wright invented airplanes2. They constructed an airplane with a propeller to move the airplane forward3. The wings on the airplane were shaped like an airfoil4. When the propeller moved the plane forward, the wings moved through the air5. As a result of this motion, lift was produced which enabled the airplane to fly