In this lesson, students will learn about the radiation levels in their state and county and compare them to levels in two other states. Teaching about radon addresses a safety issue and relates to content knowledge about radiation and geology. Disciplinary core ideas covered are biogeology and natural hazards. Tips for scaling down, scaling up, and extending the lesson are included. This book selection includes the Table of Contents, About the Authors, Acknowledgments, Preface, Introduction, and Index.