There is an old saying that a title tells half the story that follows, and the title of my talk is long enough to do just that, so that it makes for a good beginning. However, there is also another old saying that a talk should always be given a title that is short, the reason being that the short title and, consequently, the whole content of the talk will thus be more easily remembered—or perhaps it is that they will be more easily forgotten—I cannot remember which. I also cannot recall who first made such a statement. Perhaps it was me. In which case it may well be an ancient saying. I decided on the length of the title by tossing a coin. How else?

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