Responsible almost single-handedly for the restructuring of popular perceptions of humanity, Charles Darwin, the fascinating subject of this A&E original documentary, made breakthroughs during his time which, over a century later, which continue to define and shape the course of scientific inquiry. A naturalist who advanced of the theory of evolution, Darwin bravely went public with his findings despite the controversy they would inevitably engender. Few people are aware of the inner turmoil Darwin's experiments cost him, as he was in constant fear of the backlash that his "heresies" would create. Darwin's 1959 book ORIGIN OF THE SPECIES is the clearest delineation of his ideas on the diversification of the species, and continues to be hotly debated within the religious spheres of today. Here, excerpts from Darwin's journals detail his personal struggles with going public with his findings, while leading scientists and scholars, including the author of CHARLES DARWIN: EVOLUTION OF A NATURALIST, expound on the personal and public life, and the progressive work of this towering figure of science.