Developed in collaboration with the Smithsonian and esteemed literacy expert Dr. Adria Klein, includes a carefully designed leveling structure for early readers. Covering STEM-oriented topics such as comets, asteroids, moons, and more, the concepts in this reader are reinforced by photos and include vocabulary familiar to kindergarteners and first-graders. After reading this introduction to nonfiction, children can use the included quiz and glossary to reinforce their reading comprehension.