Mrs. Beth Barrett’s fourth-grade class at the Whittier School completed the Project Lead The Way (PLTW) module, “Zero Waste: Energy Waste” as part of the Commonwealth’s STEM Week celebration. In this module, students explored renewable and nonrenewable energy sources. They identified ways they could conserve energy. Students developed an understanding of solar energy and how the sun can be used to power items. They built their knowledge of solar energy as they built and tested solar-powered devices. At the end of the module, students used the design process to sketch, build, test, and reflect on their solar-powered inventions. For their design, students used existing materials that they up-cycled — reusing existing materials in a new way.