Today on ST, we speak with the bestselling author of "Just My Type" and other works of wide-ranging, culturally- or historically-driven nonfiction, Simon Garfield. His new book, "On the Map: A Mind-Expanding Exploration of the Way the World Looks," is just out. It's a detailed yet accessible survey of the age-old relationship between man and map, if you will, a study of why we as human beings are (and always have been) so fixated upon mapping things. Cartography, after all, seems to be as defining a characteristic for us (as a species) as, say, language or creativity or play.