What I find interesting is that many (if not all) people who buy this book aren't really anticipating having to survive in a post-apocalyptic world. Instead the

What I find interesting is that many (if not all) people who buy this book aren't really anticipating having to survive in a post-apocalyptic world. Instead they're more likely interested in learning about the essentials and fundamentals of society in this dire frame. It almost seems like a "500 things you should know" book dressed up with a more serious tone.