What are life and death? Is it possible to understand their essence and give clear definitions? Countless books and articles have been devoted to trying to answer these intriguing questions. However, there are still no definite and generally accepted answers. The intrigue remains. And meanwhile, human attempts to vanquish death and achieve immortality continue apace. This book is an attempt to answer the eternal questions about life and death by analyzing, synthesizing, and rethinking the known facts that characterize life. The material here should be of particular interest, as it contains many hypotheses, philosophical generalizations, and well informed speculations. What is most important for life - matter, energy, or information? How are individual lives and the phenomenon of life in general related? What serves what – does the genome serve the cell or does the cell serve the genome? What is the value of life and death? Can we become immortal? The inquisitive reader willfind original answers to these and other exciting questions in the pages of this stimulating book.