Ever curious creatures, humans have been exploring the Earth since the beginnings of civilization. As we charted known territories, we also pondered what lay in the lands beyond. Our best guesses made it into stories, paintings, and maps. But have these predictions helped us discover more? What is their role? Science is also a process of exploration. Curiosity about the world around us lead us to experiment and discover new facts. Scientists take what we know and theorize about the implications for the world beyond our immediate scope. What does mapping the unknown contribute to our journey for knowledge?