Gr 6-8–Problems mar this series. Background science, current research, and future possibilities are presented in large type and with numerous photos and occasional diagrams and sidebars. Controversial topics include questions for consideration–for example, an “In the Lab” sidebar in Cells explaining one of the roles of brain cells asks, “Can Playing Violent Video Games Make You Violent?” Kids will appreciate Genetic Engineering’s humorous introduction and use of analogies. Unfortunately, the lightheartedness isn’t continued in the other books; as topics become more challenging, the writing gets denser. Also, in an effort to simplify meiosis, important information and terminology are absent, muddying the description that repeats in Cells, Animal Cells, and Plant Cells. Occasionally, topics and photos are out of order, and the closing “Notebook” experiments are often more like kitchen fun than science.