A typical question-and-answer format is used to present these topics. The 20 questions per book range from simple ("What is a structure?" in Construction ) to complex ("What are absorption, reflection, and transmission?" in Light ), but with a single spread covering each question and answer, the information is cursory. For example, in Machines, the answer to question "How do machines help people at home?" only discusses microwave ovens. Many spreads suggest a URL for additional resources. An inset in each section offers supplementary facts or a hands-on activity such as checking a heart rate. In some cases, the instructions are difficult to follow or lack enough information. Photographs appear throughout; it's unfortunate that there are no graphics, charts, or diagrams to help clarify many of the answers and activities. The books include brief descriptions of two career options.
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