This is fascinating, but it seems like a specialized profession in and of itself to remember all of these questions. Maybe you can look it up a during a bathroom break...
I don't believe it has to be about rote memory or repeating any questions verbatim, necessarily. Rather, as with learning from converstation, from the half-conversations in this book one's imagination and knowledge of another person's perspective will already have been sparked to some degree. That, plus having some hint of what is of open interest in different fields, is part of the value.
