In this chapter, the activities use light to explore matter as it moves through magnifying lenses and other materials, investigate processes including melting and dissolving, and provide experiences that can help children understand the properties of water. Chapters 1 and 2 are also included in this book selection. Chapter 1 focuses on science inquiry and the use of “The Early Years” column to support science and engineering learning. Chapter 2 focuses on assessment and the value of assessing children’s learning to understand how to make teaching more effective. It has an example of an assessment tool showing sequences of children’s science behavior in early childhood, with related scientific and engineering practices. A materials list, teacher background information, references, assessment, and outcomes are provided. Also included in the book selection are the Table of Contents, Acknowledgments, Introduction, A Word About Safety, and Index.