Book excerpt: The Human Journey offers a truly concise yet satisfyingly full history of the world from ancient times to the present. Its themes include not only the great questions of the humanities—nature versus nurture, the history and meaning of human variation, the sources of wealth, and causes of revolution—but also the major transformations in human history: agriculture, cities, iron, writing, universal religions, global trade, industrialization, popular government, justice, and equality. Beginning with our most important questions and searching all of our past for answers, this is world history in a grand humanistic tradition.