Jim Gibson is a biologist and he is evaluating one of the most popular theoretical ideas in the field-the theory of evolution. Jim is taking the approach of a rational skeptic of the evolutionary theory. He appeals to reason as he examines symbiosis, the origin of life and organism body plans, whether or not Lucy is an ancestor of human kind, and the mathematical probability of the theory. Enjoy this podcast lecture from Jim Gibson, author of An Appeal to Reason.