Help Lucky the Leprechaun move his "gold" under his rainbow, where he can protect it! Students will apply their knowledge of simple machines and physics to create a 3-step Rube Goldberg machine. I included a PDF, as well as a Word doc, so that you can edit it to fit the materials you already have on hand. There is a page of teacher notes for helpful hints. This activity can stretch from 2-4 class periods, depending on how many iterations it takes for your students to be successful. You can adjust expectations/complexity for any grade level!