This book, produced by National Geographic Kids, is broken down into seven sections: Why Me? Why on Earth (Earth being the operative word)? Why in the Sky? Why, Where & When, Why-Fi (think technology)? Wild Whys (think animals)? and The Whys of Our Lives.
Within each of these sections, the producers of this book ask: Who? What? Can? How? Why? and more! There are sometimes "Obstacles" to straight answers, as with "Why Can't I Dig a Hole to the Other Side of the Earth?" and there are information [what I would call] side bars, i.e. "Person of Interest," (which shows up frequently throughout the book).
The pages are all very colorful and most entries aka questions and answers are accompanied by a photo or illustration of some type. Occasionally, there are easy to read / understand tables, as well, i.e. Why Do the Prices of Toys, Candy, Cars, and Everything Else Rise Over Time?
At the end is an index, a list of illustration credits, and a list of staff credits.
If you have kids (or adults) who tend to ask a lot of questions about what is what or how things work or sometimes, don't work, I highly recommend this book to them. This could keep them occupied for a long time.