Nils M. Holm's essays about highly intelligent people and IQ are worth a read here -- "Where Do The Failed 0.1% Go?" [1] and others [2].

1: https://t3x.org/files/vidya_324-325_NH_reprint.pdf (on HN 2015, 170 comments: https://news.ycombinator.com/item?id=13145853)

2: https://t3x.org/#essays