I am very bad at faces and names. Perhaps it has to do with the fact that I dont put any meaning in the appearance but only what the person does.
Not only because of that I am always amazed at the woman working at the doctor. Once I walked in there I was greeted with name - it was the second time I was there and the first was more then a year ago! I would not have been able to say with any confidence if that woman worked there a year ago or not.