WHY do elephants have trunks? WHY are clouds different shapes? WHY does my tummy rumble?Britannica's huge, authoritative, and lavishly illustrated question and answer book will satisfy even the most curious kids, with over 100 questions verified by Britannica experts. Spanning a range of topics including animals, the body, machines, space, and more, this book provides clear and accessible explanations--and even explores some of the mysteries that experts are still trying to solve!By encouraging kids to question how the world works, Britannica First Big Book of Why supports STEAM learning and nurtures enquiring minds. With stunning photography and gorgeous original illustrations by Kate Slater, this is the ultimate gift for kids aged 4+ who need to know WHY!Includes an index and glossary.