That’s a natural part of the scientific career, but, you understand, in order to be accepted as an apprentice, you have to show that you’ve done well at exams and you have to give the impression that you’re, sort of, reasonably hard working and that you’re bright and all those things. And obviously, therefore, if you get taken on with a… a very good school, Harvard, Stanford, Caltech, a number of other ones of that sort, the chances are that you’ll then have… be sufficiently qualified to go… stay there, or, usually in America, go to another place where you’ll work under somebody and that is your apprenticeship. When you get… when you’re working for your doctorate, I mean, the… the so called graduate student in the scientific world is the lowest form of life, really. He’s the one… he is the apprentice. He’s like the apprentice who fills in the little bit… corner of the picture that the master allows him to do while he’s doing the interesting parts, as they did in the Renaissance and things like that, you see. So… so… and then when you’ve got your PhD, then there’s usually another year or two when you’re what’s called a post-doc, a postdoctoral. And that’s a very crucial part of your career because again you have to get… usually go somewhere else, not always, and taken on and… now you’re beginning to choose what you want to do rather than what was suggested, you see. And that’s when you begin to… to practice. Of course, some people are so good that they… they can accelerate that somewhat, but that’s the normal course, so you certainly serve an apprenticeship. It would be very difficult to do scientific research unless you did it with someone because not only a lot of little tricks and things to learn but the whole scientific attitude has be absorbed… and what you do about publication and nowadays what you have to do to want to get money, you see, which doesn’t happen automatically by any means, you have to write grant requests and so on. So, a lot of skills of that sort which you… which you have to learn.