i can't believe that people made fun of the rumsfeld 'unknown unknowns' line. it is a really good way of subdividing the world of possible facts!

— rev. howard arson (famous archaeologist) (@Theophite) May 16, 2021

Agreed. Whatever Rumsfeld’s other flaws, that analysis was epistemologically sound.

But I also like to add the “unknown knowns.” That is, things you think you know but are completely wrong about. We’ve seen a lot of instances of that during the pandemic.