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I'm frightened of public speaking also, I'd note. But in a small meeting where I know my sh8t, I'm not afraid to justify my conclusions and opinions when questioned. Sometimes I'll admit I have a hard time explaining something immediately, but later follow up in an email with carefully worded details. We don't have to do all our thinking at live meetings. Wiki's etc. are good also for longer chains of reasoning.

Others don't seem able or motivated to do the same. If they have great logic, they hide it from the world.