This exciting reference book uncovers the answers to the big questions across core topics, from science and history to space and the human body. This encyclopedia covers all the subjects children really want to know about, like what's inside a pyramid? What is an echo? Did cavemen live in caves? With over 650,000 copies sold worldwide, this refreshed edition of a bestseller brings the latest updates in ever-changing topics for curious kids. This exciting encyclopedia for kids offers: - Important information across a range of big topics, including space, animals and the human body. - Each double page that is presented around a question a child would ask, providing young readers with an engaging and accessible route into the subject. - Quiz boxes with additional questions for children, encouraging them to find the answers themselves on the page. Why? Encyclopedia combines 3D digital illustrations and an interactive question-and-answer format to create an engaging and accessible approach to a number of core topics. This perfect first reference book brings subjects to life, with the latest updates in ever-changing topics, such as space exploration, as well as new pages on interesting topics, including artificial intelligence, climate change, pandemics, and gravity.