In one sense, they’re a parallel service to ours. In other respects, they couldn’t be more different. For a start, they’re all freelancers. Once they’ve qualified and got their tickets, they go out into the world and practice their vocation for money, usually a great deal of money. There aren’t very many of them—it’s not something you can simply decide to do, you have to be born to it, with the knack, a very rare gene, a mutation, not something that runs in families, like red hair—so demand for their services always outstrips supply, and the universal scientific principle of Survival of the
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