i say that because of a book that appeared in 1998 by tom -- the science of aging by tom kirkwood. are you aware of that volume published by oxford? >> no, i'm not. our book has 2,000 citations from the medical literature so from that point of view, you know, we rest on the shoulders of our predecessors and other researchers, you know, at any given time there are tens of thousands of researchers working in these fields. so, you know, we've relied on the works of others in order to create this. >> i suggest -- i call this to your attention because he does get into some of those core concepts that we were just discussing. i'm not in any way saying this is not an original volume, however, because i can feel the throbbing throughout. one of the interesting parts of this book is the recount by each of the authors, ray and terry, of their backgrounds, their health backgrounds and how they got to where they are today, both on the conceptual level and on the level of vocation. terry, can you recount what you say in chapter 3, your personal journey? >> yes. i became interested in longevity

i say that because of a book that appeared in 1998 by tom -- the science of aging by tom kirkwood. are you aware of that volume published by oxford? >> no, i'm not. our book has 2,000 citations from the medical literature so from that point of view, you know, we rest on the shoulders of our predecessors and other researchers, you know, at any given time there are tens of thousands of researchers working in these fields. so, you know, we've relied on the works of others in order to create this. >> i suggest -- i call this to your attention because he does get into some of those core concepts that we were just discussing. i'm not in any way saying this is not an original volume, however, because i can feel the throbbing throughout. one of the interesting parts of this book is the recount by each of the authors, ray and terry, of their backgrounds, their health backgrounds and how they got to where they are today, both on the conceptual level and on the level of vocation. terry, can you recount what you say in chapter 3, your personal journey? >> yes. i became interested in longevity