I really enjoyed this book. It skips between explanations of some of the mathematical concepts associated with the subject and the stories and experiences of the mathematicians who are working, and have worked, on the topic. It is evident that a lot of research and interviewing of top mathematicians has gone into the book. It's an interesting insight into the world of mathematicians and does well to get the gist of the Hypothesis across, without going into the mathematical detail that would make it incomprehensible to most of us. Though some explanations were very good, I'm not sure whether all the mathematical discussion would be followed by someone not familiar with maths, but I guess they're unlikely to read the book anyway. I'm am currently doing a maths degree, and thought it was a great read!