This science book shows how the subject really works, with amazing photographs showing the ins and outs of chemistry, physics, and biology! Welcome to the Explanatorium, where the wonders of science are revealed. Watch as mixtures merge and matter changes state. Discover how some chemical changes can be reversed, yet others can't, and why some reactions produce a bang! This science book for kids aged 9-12 answers the biggest and smallest questions about our Universe, whether it's elements, evolution or energy. This book brings science to life with striking photographic explanations, helping kids to understand just how the world works. This fact-filled science compendium for children offers an extensive chemistry, physics, and biology guide- explaining more than 100 scientific principles, including matter, reactions, materials, forces, energy, life, and Earth.