Every student will tell you that precious hours of study don't necessarily stick. How much do you retain? How much do you lose to fading memory? And if the task is more abstract — say to create goodwill in your community — how many warm greetings, a cheerful wave here or there in passing, how many welcome baskets, pet sits, apple pies, Girl Scout cookies will do it? If you are looking for adventure, happiness, a sense of life fully lived, how do you measure it? What dead-end towns, three a.m. truck stops, blank-eyed looks, fruitless hunches will you suffer through to find your Eldorado? How much of the journey evaporates without issue?