> Yes, in fact, they have, plus a lot more things that haven't even occurred to you. My charitable reading of the parent post is that asking these obvious ques

> Yes, in fact, they have, plus a lot more things that haven't even occurred to you. My charitable reading of the parent post is that asking these obvious questions first, then hunting down the answer is an incredible way to learn how "we" know things. I think it's a perfectly fair way to note that the poster doesn't have the complete story yet.