Fun facts fill this book.  The facts are entertaining and doled out in bite size pieces.  Symons answers questions like:
How can I tell if someone is lying to me?
When does a shower become rain?
Why do washing machines have windows?
And , of course, the title question is answered too.
Readers can pick this book up and read beginning on any page as it isn’t a sequential story which many children will find appealing. The snippets of information allow for various reading levels to be entertained.  As an adult I found this book very enjoyable and have shared tidbits with my family and with my students.