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Everyone should be up-front in expressing how confident they are in their thoughts. A suggestion should be called a suggestion; a firmly held conviction should be presented as such--particularly if it's coming from someone with a strong track record in the area in question.
boring pseudo-controversies caused by misunderstandings. For example, never waste time arguing about "life," "intelligence," or "consciousness" before ensuring that you and your protagonist are using these words to mean the same thing!