21st Century Clues: Essays in Ethics, Ontology, and Time Travel (by Charles Tandy, Ph.D.): ISBN 978-1-934297-08-7 is the Hardback edition and ISBN 978-1-934297-09-4 is the Paperback edition. These 14 previously published essays (2001-2008) take us on a journey toward a transhuman future rarely explored by professional philosophers. The journey's clues come less from the techno-optimist predictive route of many futurists - more from the disciplined context of professional philosophizing. Included is a discussion of eight types of time machines. From basic biostasis to time viewing to actual time travel, Dr. Tandy expands the categories we use to frame the future. From universe to multiverse to many-multiverses, Tandy takes us to new worlds. This allows a richness to our understanding of not only what can be, but what ought to be. Now it is time to grow up. KEYWORDS: person; cryonics; biostasis; suspended animation; future; transhuman; entropy; political philosophy; resurrection; extraterrestrial; immortality. QUOTE from Sohail Inayatullah, Ph.D., Professor, Graduate Institute of Futures Studies, Tamkang University, Taiwan: "Charles Tandy takes us on an amazing journey to our likely transhuman future. He does this less from the techno-optimist predictive route of many futurists, but more from the context of philosophical speculation. I especially enjoyed reading his explanation of eight types of time machines. From basic biostasis to time viewing to actual time travel, Tandy expands the categories we use to frame the future. From universes to multiverses to many-multiverses, Tandy takes us to new imaginative worlds. This allows a richness to our understanding of not only what can be, but what ought to be." QUOTE from Jerome C. Glenn, Director, The Millennium Project, Washington, D.C., U.S.A.: "Humanity may be emerging from small minded adolescence to planetary adulthood. We have been trying on roles of what it is to be Chinese or French, engineers or artists for thousands of years isolated into our own narrow beliefs of what we believe to be true and right. Now it is time to grow up and Dr. Charles Tandy presents the great philosophical issues of this great transition in his new book."