I loved this book for a lot of reasons, but perhaps the thing I loved best about it is how Brand examined his convictions and compared them to the latest and best factual evidence he could find and changed his mind. And that's what science means to me, that continual re-evaluation of things we think we know. The ability to change one's belief system so profoundly at Brand's age is a thing of beauty, and I admire him for it.I found the subjects he covers in this book to be very interesting. His arguments are convincing. I was already pretty pro-gene manipulation before reading this, but I had retained my knee-jerk 1970s ere bias against nuclear power. It's one of those perception bending books. No doubt some of Brand's positions will need to be re-thought in the future, but he's up for that. I had never really thought about cities and how they work, so that part was fresh for me, too.I loved the concept that we really don't need to plan for things that last a thousand thousand years (nuclear waste storage, f'rinstance), but rather we should trust future generations a little more. We need to come up with a perfectly safe and doable hundred year plan, and let engineers engineer new and better solutions between now and then. Technology will step up to that plate. It's hubris to think that we know better than our children's children's children will. The more you know, the less you fear. Highly recommended.