Ever wondered how the roots of a plant can grow through solid rock? Or what life would be like on the surface of Venus? Maybe you want to know how long it takes a drop of blood to circulate around your body, or how a solar power plant works? Here you'll find those answers and thousands more, in concise descriptions and more than 3,000 images that illustrate not just what something is, but how it works. Compact, yet packed full of facts, this chunky "little Big Book" is an exciting visual encyclopedia for information-hungry kids 8 and up who want to boost their general knowledge of the world and the universe.