Book excerpt: Like previous editions, the Third Edition of Arnharts engaging treatment of political thought is organized around a series of enduring and provocative political questions. It features the work of thirteen philosophers ranging in scope from antiquity to the present: Plato, Aristotle, Augustine, Aquinas, Machiavelli, Descartes, Hobbes, Locke, Rousseau, Hegel, Marx, Nietzsche (new to this edition), and Rawls. The questions presented are designed to illuminate issues in American politics while encouraging students to examine the nature and substance of their own political beliefs. Ideas from the natural and social sciences are introduced and applied to classic philosophical texts. Adopted as a course text at over 300 colleges and universities, Political Questions has become one of the leading textbooks in political philosophy.