Gr 5-8-Each of these slim titles provides a straightforward and clear discussion of its topic. In all of the volumes, the print is quite small, but the explanations are thorough. The first book examines how light behaves, the law of reflection, mirrors, refraction, and absorption. The second one discusses physical change and molecules; the changing states of matter; mixing and separating solids, liquids, and gases; and physical change in nature. In the last title, readers learn about water, sound, light, radio, and earthquake waves. In all, the author makes use of "Did You Know?" boxes to highlight additional facts. Full-color photographs, illustrations, or diagrams appear on almost every page, accompanied by captions that complement the text. The open layout and brevity of these titles will appeal to students.-Maren Ostergard, Bellevue Regional Library, WA Copyright 2006 Reed Business Information.