From New York Times best-selling author and world-renowned doctor and geneticist Francis Collins, a book that will forever change how you think about your body, your health, and the future of medicine.

A scientific and medical revolution has crept up on us, based on study after study, from hundreds of laboratories around the world. It is no longer just a theoretical shift: every one of us will be touched by it, and many of us already have been. The meaning of disease, our understanding of the human body, and crucial decisions about what we all need to know and what choices we make about our health are at stake.

Welcome to the new world of personalized medicine. Twenty-one million Americans are affected by 6,000 so-called rare and orphan diseases, many of which are primarily attributable to misspelled genes. And virtually all diseases have a significant hereditary component. Heart disease, the common cancers, mental illness, asthma, arthritis, Alzheimer's disease, and more - all of these diseases are having their secrets unlocked.

Francis Collins has been at the forefront of this revolution. He was, for 15 years, the head of the international Human Genome Project, and he now serves as the director of the National Institutes of Health. He knows, better than anyone, how widespread are the misperceptions about human genetics. Just in the past decade, most of what you think you know about DNA has been overturned. Nearly every day, diseases that were barely understood, or completely misunderstood, are being redefined. Families that faced common problems, without hope, are now discovering a new world of understanding, treatment, and prevention. You owe it to yourself to learn about your DNA: how it works, what it reveals, and the benefits and limits of this new knowledge.