Could this have to so with smart people increasing pursuing hedonism over reproduction? Maybe Idiocracy was right all along.
From a strict evolutionary perspective I have doubts that a high IQ is useful anymore.
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From a strict evolutionary perspective I have doubts that a high IQ is useful anymore.
On the individual level stupider people reproduce more so evolutionary speaking it's more efficient to be stupid. However if a small portion of the population has high IQ they can move society forward via say the discovery of electricity, mathematics, etc, etc. This propels every individual forward as a whole at the detriment of a few individuals who are to nerdy or geeky to get laid that often.
Thus from a high level perspective, there is selection pressure that works on the population of people that makes it so that our genes have the mechanisms in place to produce an occasional genius via specific combinations of traits or via simple on/off switch mutations that easily occur.
For reference this is a short and informative video on the aforementioned topic: https://youtu.be/sP2tUW0HDHA