When the woman he loved was diagnosed with a metastatic cancer, science-writer George Johnson embarked on a journey to learn everything he could about the disease and the people who dedicate their lives to understanding and combating it. What he discovered is that a revolution is now under way – an explosion of new ideas about what cancer really is and where it comes from. He combs through the realms of epidemiology, clinical trials, laboratory experiments and scientific hypotheses, to reveal what we know and don’t know about cancer, showing why a cure remains such a slippery concept. His luminous accounts describe tumors that evolve like alien creatures inside the body, paleo-oncologists who uncover petrified tumors clinging to the skeletons of dinosaurs and ancient human ancestors, and the surprising reversals in science’s comprehension of the causes of cancer, with the foods we eat and environmental toxins playing a lesser role. Perhaps most fascinating of all is how cancer...