Flying home from Auckland the other day I discovered that women don't have noses. At least that was the case for the little representations on the safety sheet in the seat pocket in front of me. Wherever there was a little picture of a man, it would be a person with a nose. Where it was a picture of a woman there would be no nose.

Odd, and yet somehow it worked.

I shall now have to spend some time staring more closely at people's faces, so if you see me looking at you strangely over the next few days please don't get upset: I'm just trying to work out whether you have a big nose, and why a picture of a person without a nose should look more like a woman.