[cjbgkagh]

It’s not evolution insofar as the lower IQ scores are dying, but there is sexual selection. Mean reversion is from an approximation that does not hold for the subset of the population that is sexually selecting for intelligence. Two high IQ parents will on average produce offspring that have an even higher IQ.

Cane toads at the front of the cane toad expansion quickly evolve longer legs faster than one would expect if assuming there should be reversion to the mean.

Selection of high IQ women by high IQ men is a more recent phenomenon that has to do with having women in selective education so such pairings are a lot more common than they used to be, and you need both to be selected this way in order to avoid reversion to the mean.