This book describes, in a clear, approachable manner, the progression of the experiments that eventually led to our current understanding of DNA. This fascinating work tells the whole story from the discovery of DNA and its structure, how it replicates, codes for proteins, and our current ability to analyze and manipulate it in genetic engineering to begin to understand the central role of DNA in evolution, cancer, and aging. It provides readers with much-needed knowledge to help advance their understanding of the subject and stimulate further research. It will appeal to researchers, students, and others with diverse backgrounds within or beyond the life sciences, including those in biochemistry, genetics/molecular genetics, evolutionary biology, epidemiology, oncology, gerontology, cell biology, microbiology, and anyone interested in these mechanisms in life.