The "Next Generation Science Standards" (NGSS) challenges science teachers to think beyond specific content standards when considering how to design and implement curriculum. This lesson, "Windmills by Design," is an insightful lesson in how science teachers can create and implement a cross-cutting lesson to teach the concepts of force, motion, and Bernoulli's principle. This 9-12 lesson requires students to consider the science behind windmill design by engineering windmill blades that can produce the most power in a class competition. The lesson is designed as a 5E lesson incorporating essential features of inquiry-based instruction.