It would be hard to imagine a clearer or more readable guide to scientific innovation. The book is to the point, amusingly written without being supercilious and extremely informative. The essays are properly discursive, beginning at a catchy starting point (how to loose weight or travel in time or live forever) and take in a whole universe of related information. Things I thought I understood (like stem cells), I now feel I really do understand. And even though I sat through the play Copenhagen twice, I now can go to a party where there are quantum physicists and not have to change the subject. Any of my friends who don’t want this book for Christmas should tell me now.