Let’s say it’s the morning of January 13, 1888– 133 years ago. It’s 20 degrees below zero and snow drifts are so great that they won’t melt for months. If you were the parent of a country school student who hadn’t come home the day before, you might have been awake all night, listening for a knock, tormented by worries about your child. Alive? Frozen to death? The day before had com...