there are those who talk around the topic, hoping to give enough unasked-for information to satisfy their questioners, and there are those who just plainly admit not knowing the answer.
i have the greatest respect for those who have the courage to walk the second path.
being asked a very special question during discussion (following a presentation), one of the biologists at the entomology congress replied:
“i have no idea. i wish i could tell you, but we don’t know.”
after all, knowing what you don’t know (or can’t do) can be more important than knowing what you do know (can do).