A lyrical account of an activity that is essential for our sanity, equilibrium, and well-being, from the author of Silence ("A book to be handled and savored." —The Wall Street Journal)Placing one foot in front of the other, embarking on the journey of discovery, and experiencing the joy of exploration—these activities are intrinsic to our nature. Our ancestors traveled long distances on foot, gaining new experiences and learning from them. But as universal as walking is, eac