QUOTE : I devised a sort of strategy for any sort of discussion that was over my head: I became the moderator. If you're the group's John McLaughlin, you can fake being informed while still being involved by deploying a few pointed but vague questions. If a person is holding forth and another is twitching to interrupt, jump in and ask her why she disagrees. Ask follow-up questions. Nod vigorously while saying things like 'in what sense?' or 'How, specifically?' That way, you smoothly take control of the conversation without actually contributing anything even remotely worthwhile or informative.