What makes farts so smelly? What is so good about vegetables? What is the weather like in space? What is the fastest animal on the planet? What happens when you flush an aeroplane toilet? Packed with 100 pressing questions about space, Earth, animals, bugs, food and the human body, First Big Book of What provides answers for every curious child (and their grown-ups). Discover astonishing extremes, from ‘What is the fastest vehicle in the world?’ to ‘What is the biggest muscle in the body?’; puzzle over playful ‘what if’ scenarios, such as ‘What if… T.rex was still alive?’; and enjoy wacky facts that bring science to life! From the team behind the bestselling First Big Book of Why, this trusted compendium combines Sally Symes’ warm, playful writing with Kate Slater’s gorgeous, friendly illustrations, as well as stunning photography. And every answer has been checked by real-life experts, who you will meet at the back of the book.