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Gr 5—9—Gardner's in-depth exploration of green topics will inspire interested students to think outside of the book to discover dynamic science-fair projects and perhaps even pursue careers in the ever-expanding field of green science. Each title opens with a basic introduction to the topic, which is followed by a definition of the scientific method and a note about science fairs, letting students know that taking an experiment directly from a book will not impress the judges. In keeping with this advice, Gardner provides plenty of information, well-designed experiments, and demonstrations, and then shares brief science-fair ideas that range from simple variations and expansions to suggestions that readers fully design experiments. Experiments and demonstrations are presented with clear step-by-step instructions and occasional illustrations and represent a wide range of complexity. Supplies range from simple household items to specialized scientific equipment, making it easy for everyone to find something to try.