Yesterday afternoon the airplane carrying me from London was on approach to the airport in Palma, Majorca. As I looked through my window I was concerned that we were landing in a rather heavy fog, but I had confidence in ground radar and our pilots. After we landed safely I looked through a window on the opposite side of the plane, to see no fog at all. I looked back through my window. Heavy fog.

Was there fog on my side of the plane and not on the other? No. My window was fogged over, creatin...