Stephen Hawking had such a bright optimism for humankind, and this book turned out to be his spectacular, bittersweet, last correspondence to us all. He tackles big questions in such a way that you forget they are big. That isn't to say he makes the big questions seem trivial, just that he has a way of conceptualizing problems in such a way to make them easy to parse.
You don't need to be a mathematician or physics wiz to understand and enjoy this book; I think just about anyone can gain something from reading Hawking's Brief Answers.