"Both precision and certainty are false ideals," observed Karl Popper, the great philosopher of science. "They are impossible to attain, and therefore dangerously misleading if they are uncritically accepted as guides." In the vigorous discussion of terroir taking place today, we increasingly find ourselves susceptible to Popper's "false ideals." A variety of reasons are surely at work, but one that stands out—indeed it's very much a metaphor for how we live now—is the ubiquity of GPS. Wine Spectator's Matt Kramer explains.