In this huge, authoritative and lavishly illustrated question and answer book from Britannica, you'll find the answers to all those questions curious kids want to know. Why do elephants have long trunks? Why are clouds different shapes? Why does popcorn pop? Why does your tummy rumble? Why do we flush the toilet? This magnificent book features chapters on Space, the Body, Pets, Wild Animals, Bugs, Food and Machines, and also includes some of the mysteries which experts are still trying to solve! By encouraging children to question how the world works, the Britannica First Big Book of Why supports STEAM learning and nurtures enquiring minds.