Thirteen miles isn’t very far: roughly the length of Manhattan or the distance you run in a half marathon. On a freeway, it takes less than 15 minutes to drive. Multiply 13 by 10, though, and it becomes 130 miles — more than the width of the state of Connecticut. Move the U.S. border 130 miles north, and Whistler Blackcomb becomes an American ski resort; move it south, and Tijuana is the new Los Angeles. If you started walking, it would take you 35 straight hours to cover the distance; if...
