What is the nature of reality? At the root of our society's deepest political and cultural divisions are the conflicting principles of four global worldviews. While each of us holds to some version of one of these worldviews, we are often unconscious of their differences as well as their underlying assumptions. Mary Poplin argues that the ultimate test of a worldview, philosophy or ideology is whether it corresponds with reality. Since different perspectives conflict with each other, how do we make sense of the differences? And if a worldview system accurately reflects reality, what...