Gr 4–8—Bright colors, short paragraphs, ample photos, and diagrams will please browsers looking for answers to intriguing questions like why humans have two sets of teeth or how scabs form. How Many Cells provides an overview of body systems as well as explanations of cell growth and division. Each volume concludes with the same two-page diagram noting different systems to answer "How does everything work together?" Students searching for specific topics can consult tables of contents and indexes. Related questions usually appear in two-to-four-page sections, although some topics receive more attention, such as eight pages devoted to digestion in What Makes Your Heart Beat.
VERDICT Although not a replacement for straightforward explanations of body systems, these volumes have definite browser appeal and may spur readers to pursue additional research on topics of interest.
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