Engineer Through the Year 35 Author:Sandi Reyes Engineer Through the Year, gr. 3-5 20 Turnkey STEM Projects to Intrigue, Inspire & Challenge Introduce students to Sandi's simple five-step engineering design process. Then, as you guide them with careful questioning, watch your budding engineers apply their knowledge to design their own unique rockets and catapults, ski lifts and parachutes, gr... more »eenhouses, roller coasters, and more.« less