Chapters 6–13 share grades 3–5 model lessons for putting the “explore-before-explain” mind-set into practice. In this chapter, the model lesson is aimed at explaining why objects appear different underwater versus out in the open. The lesson begins by having students make a prediction about how different substances change the behavior of light. The activity box included is meant to provide a professional development experience and promote job-embedded learning. Teacher background information, safety notes, standards, and assessments are provided. This book selection also includes the Table of Contents, Foreword, Acknowledgments, About the Author, Preface, Introduction, References, and Index.