Discover the fully updated, new edition of DK's bestselling reference book - containing all the latest knowledge and current thinking in a fresh new design. When? Where? What? Why? This stimulating and comprehensive encyclopedia answers all the burning questions that curious children love to ask! Each chapter is jam-packed with maps, charts, timelines, diagrams, beautiful images, and amazing facts. Did you know, for example, that a single drop of blood contains five million blood cells? Or that there are areas of desert on all seven of Earth's continents? Prepare to expand your child's knowledge on a wide range of fascinating topics - including Earth and beyond, plants and animals, history and politics, science, technology, and the human body.