Since the time of Einstein, ideas of parallel universes have grown from far-out concepts to mature scientific theories. Using everyday analogies and do-it-yourself models to simplify intimidating concepts, students will learn about the most fascinating topics in modern cosmology, such as the big bang theory, inflation, wormholes, and higher dimensions. Student learning is enhanced by illuminating diagrams and informative sidebars that explore related timely topics in depth. This book supports the Next Generation Science Standards' emphasis on evidence-based theories by discussing past observations and future tests of each parallel universe theory.