LONDON — Find a globe in your local library or classroom and try this: Close the eyes, spin it and drop a finger randomly on its curved, glossy surface. You’re likely to pinpoint a spot in the water, ...

If you open Google Maps on your computer (go ahead, I'll wait), you'll likely see the town or city you live in, or maybe the last place you looked up. Now, zoom out. No, more than that. Keep going.