This book is a personal mixture of well-established results and speculative intuitions on Life. The reader should not be afraid by it and try to gain a bird’s-eye view of the coherence of the whole. The reader will often be asked to accept in an unconventional situation, adopting a linguistic and computing science point of view, rather than a more traditional biological and/or mathematical point of view. They should then wonder whether these unusual propositions make sense or not. In case my propositions are unconvincing, the reader may easily return to the usual biological interpretation. If there is a small chance that they prove convincing, then I hope that the reader will join forces with mine to explore the linguistic view of nature. I sincerely hope that they will benefit by reading this book and thus discover a radically new and potentially fruitful understanding of life.