Have you ever gone hiking in the woods in winter? You start down the meandering path, breathing deeply to fill your lungs with the crisp, fresh air. As you go farther along, you notice subtle scents of evergreen needles, dormant trees and damp leaves. You look up to try to catch a glimpse of the scolding squirrels jumping from branch to branch overhead, and suddenly you realize the path ahead abruptly splits. You stop to look around. Both paths appear well travelled, the snow equally trampled in both directions, but you cannot see ahead to where each path leads. How do you choose which way to go?