From a single cell--a fertilized egg--comes an elephant, a fly, or a human. How does this astonishing feat happen? How does the egg "know" what to become? How does it divide into the different cells, the separate tissues, the brain, the fingernail--every tiniest detail of the growing fetus? In this Very Short Introduction, renowned scientist Lewis Wolpert shows how the field of developmental biology seeks to answer these profound questions. A distinguished developmental biologist himself, Wolpert offers a concise and highly readable account of what we now know about development, discussing...