Copernicus and Galileo's sun-centered model of the solar system gave us our view of space. Newton and Einstein's mechanical and electromagnetic models of the universe gave us our view of nature. Can the human condition be captured with a similarly universal model? Author Lawrence H. Taub believes so, and he develops three of them-age, sex, and caste-to reveal the deeper currents of history. The models presented in "The Spiritual Imperative" clarify the past, explain the present, and help anticipate the future. Taub uses these models to make insightful forecasts of future discontinuities that...