A cutting-edge examination of what it means to be human and to have a 'self' in the face of new scientific developments in cloning, gene-splicing and neural downloading.After seeing his own cells used to grow clumps of new neurons – essentially mini-brains – Philip Ball begins to examine the concepts of identity and consciousness. Delving into humanity's deep evolutionary past to look at how complex creatures like us emerged from single-celled life, he offers a new perspective on how humans...