Includes index.

"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! "--Cover.

Bugs -- Pets -- Wild animals -- The body -- Food -- How stuff works -- Earth -- Space.

"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!"--