Simple and easy activity to make and test. The video introduction offers good insight into some of the challenges that NASA needs to consider and relates it back to the need of building test models and designs. The design of this activity can be drawn on white paper, which allows students to get creative with different variables of testing the paper helicopter such as making wider blades, a shorter body, or changing the angle of incidence, etc. This is also a good tool because it reinforces the process of the scientific method.