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For instance, I mentioned Stonehenge to some guy probably 20s and he though I was referencing being stoned, as with the marijuana. Another time, a chick, early 30s, who was preparing something about languages, I mentioned the Rosetta Stone. She hadn't heard of that (and not the fucking software of the same name). Another time, some lady, I don't fuckin' know 40s, more, whatever, was not familiar with rulers enough to know that a cm has 10 mm.
Killer Lettuce🌹 !HonkUK.BIE joined in and replied with this 17 minutes ago, 1 hour later[^][v]#1,460,543
I don't know, I think that the Rosetta Stone isn't something you'd know about unless you have an at least cursory interest in history or linguistics. I am willing to give early 30s chick a pass on that one.
I am with you on the other two things, though. I think that Stonehenge is popular enough that it should be common knowledge.