I don't know that I could even quantify all the I learned from this book. It covered his writings from the early 70's through about 1999. Some were a little outdated, but many of the issues he wrote about in the 70's are still very relevant today - the need for civic involvement, corporate greed, the role of the media, and so much more. It took me a long time to read this book, but I enjoyed it very much and learned a lot. And now, I'm on to his more recent writings!