Britannica's First Big Book of Why : Why Can't Penguins Fly? Why Do We Brush Our Teeth? Why Does Popcorn Pop? the Ultimate Book of Answers for Kids Who Need to Know Why! (First Big Book)

"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!"--