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I'd like to know which "known facts" have been investigated at all and listed 5 inviting others to, in fact, add to the list. Should I instead ask a separate question for each one?
Yes, these should all be separate questions.
Each question should address one specific topic. While some of the topics covered in your question are related, they are all specific enough to stand alone.
Also, as indicated in the comments, some of those questions have already been asked.