Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Very good!

This book explains very well the way that DNA works. It answers some questions like, "How can I share 90% of my dna with a mouse?" "How do mutations eventually lead up to a change in an animal's form?" I had never heard a satisfactory explanation for how genes function before reading this book. It was very easy to understand, and an enjoyable read.It was a tad repetitive, with the author listing a couple of very detailed examples for every point he made. To be honest I appreciate this, but I did skip over some material after I had gotten the point of the chapter.I love popular science, particularly books about prehistory and evolution, but I avoid those books that are all about God vs. Evolution. Yes, the religious right is a very large, colorful, tantalizing target, but I prefer just the science. This book was great in that respect.