Everything seems quieter when it rolls in, muffled as when it snows. I'm on my bike returning from a dinner. A boy there, one of my students actually, was worried at first about me biking in the fog, but when I told him I lived near the school he said, "Ok va bene, al meno non è dall'altra parte della città." As long as you're not on the other side of the city. But I didn't really realize just how dense it had become. The city emerges bit by bit, people, cars, buildings becoming distinct and…