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RE: Dumb & Dumberer: Why Are Human Brains Shrinking?
It is definitely a complex issue, and I suspect that the different theories all have some play in it like you say. If people today are any indication, a high IQ often means that procreation is lower compared to an average or below IQ individual.
Joe Rogan did a hilarious bit on dumb people having kids. I wish I could find that clip
The introduction to the movie Idiocracy is also pretty good.
But we are missing a trick in linking breeding to IQ. It is going to be the more aggressive males that procreate most successfully.
Kind of brings us full circle