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Not to be picky, but if we consider Earth a civilization, (a stretch, I know), and 42 is representative of an absolute, that would leave 41 we could contact.
Do you suppose that might mean that different subjects learn better in different ways? This argument has been going on since at least the 1950s, that I've been aware of, (prior to that, I was led to believe, the teaching of phonetics dominated.) Is it just possible there is no "one size fits all"?
Obviously, when making such a determination of fact, the fact-check would have to be transparent. Indeed, this is all about transparency, which tends to illuminate the facts of a situation.