This episode covers the 1989 Nobel Prize in Physiology or Medicine, which was awarded to J. Michael Bishop and Harold Varmus. The Nobel Assembly at the Karolinska Institute chose to give Bishop and Varmus the award “for their discovery of the cellular origin of retroviral oncogenes”. Topics include Bishop and Varmus’ discovery of the first cellular proto-oncogene c-src, how the discovery of that gene lead to a fundamental shift in our understanding of the essence of cancer, and Beowulf.