Woke up this morning around 3, 4 a.m. Stumbled into the bathroom, where I happened to glance out the window. The combination of light from the nearly-full moon and the thick layer of frost from a cold, cloudless night gave the world outside an otherworldly silver glow. A few hours later, after sun-up, the outside thermometer read 19 degrees.
Insulation. Thermal underwear. They're good things.