In 1859, Charles Darwin published On the Origin of Species. In it, he argued that all of life on earth was the product of undirected natural processes: Time, chance, and natural selection. Since Darwin, biologists have relied on such processes to account for the origin of living things. Yet today, this approach is being challenged as never before. Unlocking the Mystery of Life tells the story of contemporary scientists who are advancing a powerful but controversial idea—the theory of intelligent design.