The invisible world of microbes - capable of surviving in the most harsh and inhospitable conditions on earth - reveals the remarkable potential and resilience of life itself. John Postgate's fascinating exploration of these outer reaches of life shows how understanding microbes can provide new clues to the origin and evolution of terrestrial life, and offers glimpses of how life might have established itself elsewhere in the universe. In the process, it raises profound questions about death, sensation and individuality, and insights into the nature of scientific progress. The feats of modern biotechnology are just one manifestation of the astonishing resources of microbes illuminated in John Postgate's lucid and intriguing account.