I think there has to be some correlation between the level of effort required to obtain a piece of information, and the importance our brains assign to it for t

I think there has to be some correlation between the level of effort required to obtain a piece of information, and the importance our brains assign to it for the purposes of recall. I know people who can recite verbatim something they studied in a library 20 years ago but have to Google the same recent data each time they need to reference it.