I agree that modulation and divisions of labour reduce the limits otherwise imposed by human working memory. I'm not sure that the same is not true of lifespans

I agree that modulation and divisions of labour reduce the limits otherwise imposed by human working memory. I'm not sure that the same is not true of lifespans, namely, what kind of thinking cannot be sufficiently comprehended as to be tackled within one lifetime? I know of nothing, and this may be ignorance, that takes more than a PhD to comprehend (of course, one wants more than to comprehend, but one can begin to contribute once one comprehends). I was more thinking of the limits of humans ability to internally represent processes that we do not observe within quotidian life, and problems which requires such leaps of creative genius - like Einstein but 100x - that we cannot hope to traverse the chasm of our own stupidity in that singular moment of discovery.