Set includes: 4 Books (1 each of 4 titles). Bursting with hundreds of facts and the highest quality photography and artwork, these books enthrall and stimulate the minds of struggling readers. Nonfiction titles cover core subjects in a consistent format. Each book, written by an expert in the field, guides the reader methodically through the topic. Difficult terms are spelled phonetically. With over 100 color images per title, readers gain multiple access points to truly engage text. Nonfiction titles are ideal for research, and perfect for a thrilling, fact-filled read. A comprehensive, informative, and highly readable introduction to four interesting topics of science. Written by experts and based on the latest research.