How is the area of a room calculated? What is the difference between imperial and metric units? Can the height of mountains actually change? Readers will find the answers to these and other questions within the titles in this series. Sidebars supplement the main text with details about the heights of various animals or using lasers to measure distance. Photographs show various measurement technology such as an Aztec Calendar Stone or a digital jewelry scale, as well as examples of things to be measured—the speed of a Lockheed SR-71 or the area of a rainforest. Each book offers several suggested problems to apply what has been read along with an answer key. There is also a hands-on activity, a list of additional books and websites for further investigation, and a glossary. VERDICT Recommended to update library collections and for classroom use.