This is part of the “Matter Close-Up” series where each book starts with a definition of what matter is. Each book uses slightly different and accurate explanations. Each book has “What do you think?” questions that help the reader to interact with what they have read. This is an excellent reading strategy. Properties are features that matter will have and there are different ways to measure the different types of matter to collect data. The photo of the cat being measured by both a meter stick and bananas gives a great deal of information but also stresses the importance of using the correct tool when measuring. Most countries use the metric system but in the U.S. the customary system is used. Bolded words like “customary system” are explained in the glossary and it is also described as a noun. Displacement is clearly described along with a picture of an orange slice displacing the same amount of water in a bowl. Terms such as displacement, graduated cylinders, and balance are used, pushing the reader to a richer vocabulary. Line graphs are to be used when you want to show change over time. A bar graph illustrates how thing compare. Interpreting the graph, an essential skill, is modeled at the end of the book. This is a perfect start to science in the classroom. Reviewer: RevaBeth Russell; Ages 6 to 9.