This lesson introduces the concepts of energy as the ability to do work, energy transformations, and potential and kinetic energy. It also presents the concept of scarce resources as an introduction to the module’s final challenge, the Water for All Challenge, in which student teams will design solar-powered devices to address water scarcity. Students learn about the engineering design process (EDP) and are challenged to use this process to create a marshmallow launcher that exhibits energy transformations. We recommend reading Chapter 3, which is included in this book selection and provides a module overview and summary. A materials list, safety notes, standards, teacher background information, assessment, and Internet resources are provided. This book selection also includes the Table of Contents, About the Editors and Authors, Appendix, and Index.