...but is there in all its glory to shame me on Wikipedia. Just one example of many; I used to know what the stuff on this page was all about...
https://en.wikipedia.org/wiki/Mole_(unit)
It was all obvious at one time, but now it's mince . I'm annoyed that stuff like that seems to have evaporated into a volume of gas where brain cells used to high-five. I used to think I was smart (or was that smart-arsed?). Chemistry was not my field in the workplace, so that example probably just died in my own head from lack of use.
Then again, there are things I was never taught, but now find fascinating. (Stop yawning at the back boy!) That I don't understand those is less annoying, but am curious about them. How about historical linguistics & geology? (I said stop yawning at the back boy!!!) The former is still a complete mystery to me (how can migrations of peoples over a thousand years be traced from the odd diphthong?), but I have at least tried reading up on rocks.
Does the old adage apply that my head only has so much space?