I found this book difficult to follow, with too many side stories and unnecessary details. I did learn a lot about different scientists, as well as a bit about genetics, and I commend the author for attempting to take heavy material and make it understandable for the general public, but I just couldn't stay focused while reading it. Beyond that, I feel like the author didn't really have a thesis to begin with. It is a bit of a stretch to say this book actually had a point.