About the Book: This captivating book offers over 150 intriguing questions about space, Earth, machines, animals, buildings, and the human body. Created by the acclaimed author-illustrator team behind the bestselling First Big Book of Why, it provides clear and trustworthy answers for curious children. Each fact is carefully fact-checked and reviewed by expert professionals featured in the book. Perfect for young learners eager to explore science and the natural world. An essential educational resource for children’s curiosity and knowledge-building.