It's just about the middle of January, and just now has winter come to DC. I don't want to say that it's cold or anything but we've gone from wearing t-shirts and shorts outside to frost on the windows and multiple layers of clothing because the temperature has been below freezing for much of the day. As if that weren't enough, the wind's been cold enough to feel like it's cutting right through you, and the pressure waves of cold air coming off of the Metro trains when they arrive at the station are enough to deaden one's sense of …