On Methusaleh's Trail is a story about the search for fossils of long extinct species and how they are related to some living species which have changed very little in tens or hundreds of millions of years. Modern Homo sapiens left Africa maybe 50-75,000 years ago and our closey related ancestral hominids date back maybe 2-3 million years. However, animals such as the nautilus, the coelacanth and the horseshoe crab are some of the last remaining species of genera that were once prolific and numerous and they have persisted to this day, largely unchanged, for tens or hundreds of millions of years. In reading this book one really gets the sense that the author, Dr. Peter Douglas Ward, is reflecting back on a long, interesting and successful career, perhaps even feeling a bit like a living fossil himself. What is clear on every page is the author's passion for his work and his mastery of the subject matter. His search for fossils has taken him all over the world to some of its most remote corners. The book is an excellent overview of the world's geological and biological development. It describes the major periods and epochs and some of the great cataclysmic extinctions that have occured in the past, wiping out 50-90% of all life on the planet. What is also evident from this book is that paleontolgists must also be expert geologists in order to identify the right type and age of rocks in which the fossils they are looking for are most likely to be found. For those of you who found this sort of thing interesting in high school or college and have since found yourselves working in an office the last few years, get a copy of this book and Your Inner Fish by Neil Shubin and rekindle your interest in science. You might even be inspired to go fossil hunting or rock hunting with your kids as a way to engage their interest (plus, do you really want to go to the "Happiest Place on Earth" for another summer vacation?).