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Re:The Cost of Avoiding Sensitive Questions by rriepe on Sunday December 15, 2019 @11:12PM (#21800738)
If your parents are in town and ask where the nearest weed dispensary is, you might pretend not to know, even though you know. That's an unknown known.
Re:The Cost of Avoiding Sensitive Questions by quelltext on Monday December 16, 2019 @05:16AM (#21802046)
But you still know it. Pretending not to know doesn't render it unknown knowledge.

To the other person/parents they don't know that you know, but that's looking at knowledge of party a vs. party b, which is mot quite what all this is about. Yo your parents it's still a known unknown (hence why they ask you).

I believe the closest to unknown knowns would be temporary loss of knowledge, where at a given moment you don't manage to make the right connections between the known knowns. So it's a "could know" given the right moment or prerequisite calculation step/thought, but right there you don't so it's an unknown known.

Re:The Cost of Avoiding Sensitive Questions by rriepe on Monday December 16, 2019 @10:52AM (#21803927)
Yeah, I think the add-on is more of a cheeky social commentary.

Biases could also be unknown knowns.