Traversing six key frontiers of human biology, Daniel Davis shows how these radical possibilities have been made real - thanks to the ingenious, decades-long work of scientists whose breakthrough discoveries are transforming our understanding of how the body works, what it is capable of and how we might manipulate it. By bringing together the latest understanding of the immune system, the brain, the microbiome, the interaction of cells and the development of the foetus, including developments such as optogenetics, super-resolution microscopy, the human cell atlas and systems biology, we arrive at a vision of the human body of dizzying complexity, wonder and possibility.