We Have No Idea: A Guide to the Unknown Universe

This book is mostly targeted towards the interested enthusiast, someone who may not have the formal education, but is somewhat familiar with at least some of the subjects.

For this reason, the book doesn't go into great detail on any of the covered subjects and avoids the use of equations, but does include a detailed bibliography where you can find more information.

I would have liked a little more depth in some areas personally, but I think the book accomplishes what the authors set out to do.

And hey, I liked the humor. So sue me. :D