We are living through a revolution in biology. Giant strides are being made in our understanding of why we age and die, and why some species live longer than others. Immortality, once a faint hope, has never been more within our grasp.

Examining recent scientific breakthroughs, Ramakrishnan shows how cutting-edge efforts to extend lifespan by altering our natural biology raise profound questions. Although we might not like it, does death serve a necessary biological purpose? And how can we increase our chances of living long, healthy and fulfilled lives? As science advances, we have much to gain. But might we also have much to lose?