Drawing on philosophy, psychology, sociology, politics, biology, and theology, Stevenson introduces readers to the endlessly fascinating subject of human nature. He outlines background theories of the universe, basic approaches to human nature, diagnoses of what is wrong with humankind and prescriptions for putting it right while offering clear, critical analyses of the ideas of Plato, Christianity, Karl Marx, Freud, Sartre, Skinner, and Lorenz. Including completely revised and updated bibliographies, the second edition also provides a new interdisciplinary final chapter suggesting areas of further inquiry.