The purpose of this assessment probe is to elicit students’ ideas about electric charge when they rub balloons on their hair. It is designed to reveal whether students recognize that objects charged in the same way repel each other. The probe is best used with elementary and middle school students. A materials list, teacher notes, standards, assessment, safety notes, and references are provided. This book selection also includes the Table of Contents, Preface, Acknowledgments, About the Authors, Introduction, and Index.