Whilst, as I said, we were certainly training professional chemists and they knew really quite a lot about the chemistry of the elements, which is my particular interest, and other aspects of physical chemistry and organic chemistry, they knew more than that. They had a background appreciation of why we were doing the chemistry, what the situation was in the current climate that we were in, in the civilisation, if you like, that we were living in and the place of chemistry in that. And to get them to think about it, I gave over some of the practical period time to writing extended essays. It’s perhaps not unlike the technique in Oxford and Cambridge, where a student will be asked to prepare an essay on a particular subject, particularly in Oxford where you’d read it to the tutor and have a discussion on it, and depending on the quality of the student and, particularly on the quality of the supervisor, you’ll get a good discussion and the student would learn something from this. And sometimes, perhaps, in the best possible cases, as with Longuet Higgins and Ronnie Bell, you’d get a new theory coming from that in the boron hydrides that I was mentioning.