Without mincing words, this was a fascinating read.
It is a simple, lucid and logical explanation of the principles of evolutionary biology. That we all began as single celled organisms, and then through natural selection, evolved into what we are today.
Apart from the content, what wins points for me is that this book is extremely easy to read and understand. It's not written as a science book as much as a series of interesting stories. And at every point, it makes you think about the history of your body parts (your limbs, for instance, were once many millions of years ago, fins) and about the sheer beautiful underlying logic of the natural world itself, of which we are only a part.
Forget the last few chapters (where, in my opinion, Keith Harrison rambles off into medicine and all sorts of other areas that I didn't want or expect). Read this book for the first ten chapters (only a hundred pages or so, not as daunting as you'd think). And wonder!