Why are we cruel? Why are we kind? Charles Darwin, the father of modern biology, wrestled with these very questions in order to explain the human race, struggling to fit a loving God into a harsh and challenging world. Animal behavior scientist and evolutionary biologist Jacob Johnson's entertaining new take on Darwin's work explores his crisis of faith, the origin of morality and the evolution of "good" and "evil." From trees that help their neighbors to whales that mount daring rescues, Johnson's book provides optimistic insight into what the natural world reveals about who we are and how we got here.