For 21 years, Charles Darwin kept his theory of evolution secret from all but a few friends. He confided to one: “It is like confessing to a murder.” His torment resonates in society today—in the challenge his incredibly powerful idea poses to our understanding of our world and ourselves. This program interweaves the drama in key moments of Darwin’s life with documentary sequences of current research, linking past to present and introducing major concepts of evolutionary theory. It also explores why Darwin’s “dangerous idea” matters perhaps, even more, today than it did in his own time, and how the idea conveys the power of science to explain the past and predict the future of life on Earth. Narrated by Liam Neeson