An informational tale...“I’m going to dig my own grave,” I announced. None of the other people clustered around the fire looked alarmed. In fact, a few of them smiled.It was late afternoon on Saturday, February 11th, at a campsite on Boulder Lake in northern Minnesota. The others were fellow college students. We were out here for a night of winter camping. Snow trenches, or, more evocatively, “snow coffins,” are body-sized holes you dig out of the...