This document provides instructions for making a pinwheel to demonstrate how wind power can run machines like windmills. Students are instructed to cut and fold construction paper into a pinwheel shape and attach it to a pencil with a push-pin. When blown on, the pinwheel spins, illustrating how wind turns the blades of a windmill to generate energy, just as the moving air powers the rotation of the pinwheel. Questions encourage students to observe and explain how wind provides the power source to turn the pinwheel or windmill blades.