How did Richard Feynman's fluid intelligence change with age?
Answered by: Neal King
A professor of mine who knew Feynman in his younger days told me that Feynman had mentioned a practice he had: He would go through the current issue of Physical Review, and for each article, he would read the abstract and the beginning; and then he would guess how the article would end. He would then check, and if his guess was right, he would skip the rest of the article; but if his guess was wrong, he would read it.
Later in life, he probably didn't have the time to do this anymore, but probably relied on colleagues to ask him about interesting or potentially interesting developments.