You are not alone! Like it or not, every human being and virtually every living creature is, in a sense, owned and operated by legions of prehistoric organisms, hordes of them in each cell in the body. That is one of the startling revelations as NOVA... (more) explores the mysterious wonder of life with Dr. Lewis Thomas, a leading biologist and award-winning author described by Time as "quite possibly the best essayist on science anywhere in the world."