I live in the Boston area, which means that January is cold. It was 8° (Fahrenheit) here yesterday. That’s not that big a deal around here, but here’s the thing: Somehow during the drive home in the evening, I managed to get my right index finger frostbitten. It was pale and numb, until I soaked it in some warm water and it returned to the same cold-pink as the others. Today: gloves.