I was surprised that I actually liked this book.  There seems to be a trend in using the gross-factor to catch the attention of readers, and I picked this book simply figuring it would be able to catch the eye of some reluctant readers, but I was surprised by how much sound science was clearly explained.  I was surprised that the publisher suggests the 300s for Dewey placement, as I would be inclined to put it in the 600s.  My one criticism of the book would to say that I found the yellow liquid graphics that are meant to look like pee spilled around the edges of the pages were a bit much.