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A laser is a device that makes a beam of light. The light from lasers can be used in many special ways. Lasers help people every day! Learn about the many ways that lasers are used with this nonfiction book! Along the way, you'll practice measuring length. This math book seamlessly integrates the teaching of math and reading, and uses real-world examples to teach math concepts. Text features include images, a glossary, an index, captions, and a table of contents to build students' vocabulary and reading comprehension skills as they interact with the text. The rigorous practice problems, sidebars, and math diagrams extend the learning experience and provide multiple opportunities for students to practice what they have learned. The Math Talk section provides an in-depth problem-solving experience to challenge higher-order thinking skills.