Everything your student needs for Books 1 through 4, all in one place. This complete elementary curriculum set includes all four 3-Book Trios (twelve books), plus the Elementary Experiment Book, thirteen books in total. Each level, Book 1 through Book 4, comes as a 3-Book Trio: the student textbook, the student pages, and the teacher pages. It is open and go, with everything printed and ready to teach. Whether you're starting from scratch or filling in gaps, this set gives you every resource you need to teach confidently and completely. The Atoms First Sequence: These are not four interchangeable books. Each one plays a specific role in building real scientific understanding, in order: Book 1: The Atomic Map for Real Scientific Understanding — Students learn what atoms and molecules are, the correct starting point, then use that atomic lens to explore biology, physics, geology, and astronomy. Book 2: The Scientific Toolkit for Independent Discovery — Students learn how scientists investigate, building the Scientist's Toolbox of observation, measurement, and models through hands-on practice. Book 3: When Atomic Theory Explains Everyday Life — Students apply that toolkit to see how atomic theory connects across every science and explains the world around them. Book 4: From Atomic Behavior to Complex Systems — Students build from the behavior of atoms up to the complex systems those atoms create. Every book draws on chemistry, biology, physics, geology, and astronomy, always through the Atoms First approach, so concepts connect instead of sitting in isolated units. What's in Each 3-Book Trio: Student Textbook: The core reading text that introduces each concept with clear, engaging science written for elementary-age learners Student Pages: Printed study notebook pages, hands-on experiment pages guided by the RATATAZ method (Read, Ask, Test, Answer, Talk, and Dazzle), and end-of-chapter quiz pages, open and go with nothing to photocopy Teacher Pages: Four-day lesson plans, full answer keys, step-by-step experiment instructions, and quiz keys, so you always know exactly what to do, even without a science background Also Included: The Elementary Experiment Book (Science Books 1 through 4) gathers the hands-on experiments for all four elementary levels in one volume. Four levels. Twelve books plus the Elementary Experiment Book. One complete elementary science curriculum, open and go. Also available: Middle School Set (Books 5 through 7) and the RS4K Science Home Library (all 7 books).