I'd never prepared an exam before, I didn't know how to make exam, I'd never been a teaching fellow or teaching assistant or professor. And so I finally got together a good exam and then the blue books came all back and how should I rate them? And I started from the top down, according to the alphabet, and gave what I thought was the appropriate grade. And then I said, ‘Wait a day’, and then I did it again the next day, except I turned the pile over and started from the bottom and graded all the things. And then I compared the grades of yesterday with the grades of today, and fortunately quite often they were the same but there were quite a few discrepancy and then I had to go back again to the paper and see what… at… the latest analysis I would give. So it was a very painful process for me to learn all these things that a professor has to know, and there was one thing that very much bothered me. I had one student in the class, she was a very beautiful girl. Her name was Miss Eriksson, I still remember it. And she submitted a blue book in which she had… in which she answered all my questions correctly, but it was almost as if she had duplicated what I had said. In the whole thing – and there were several essay questions – there never was an original thought, there never was anything that indicate originality. It was all just regurgitating what I had said in the class. And I said, ‘Now what kind of a grade can I give her?’ She of course will expect an A but without any thought of her own in this thing, how can I give her an A? And I finally gave an A- and I'm quite sure that poor Miss Eriksson was deeply disappointed, she had everything right, how could I give her an A-? And even to the present day I feel just a little bit guilty that I didn't give her a straight A.