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Our toilets toil away for us every day. Yet, they get little thanks for their hard work! When you think of toilets, you probably picture one in your home. But, toilets can be very different around the world. At first glance, a toilet is a simple device, but they are critical for proper sanitation. There are many people worldwide who do not have access to a toilet. Let's dive into an exploration of the history, importance, and inner workings of toilets! This nonfiction book combines math and literacy skills and uses everyday examples of problem solving to teach subject area content. The full-color images, math charts and diagrams, sidebars, and practice problems make learning to measure volume relevant and fun. Text features include a table of contents, glossary, and index to increase understanding of math and reading concepts. An in-depth problem-solving section provides additional learning opportunities while challenging students' higher-order thinking skills.