This video is great as a primer for a unit on motion and design. It introduces the very elements of design that make motion possible: simple machines. It briefly goes through each of the different types of simple machines, that we see every day in our lives. And Bill Nye never fails to make science appealing to students. It sparks their interest as well as serves as a refresher for teachers. It also gives teachers ideas for lessons and scientific inquiry they can have their students engage in.