The authors only need to look back at the 17th Century to see that the potential for human intelligence lies in both the natural and nature realms.
The Scots began educating their young in mass in order to prepare them for an ever increasing division of labor, and by doing so increased their level of intelligence (critical thinking) AND independence (two of the pressures of evolution). This leads to higher gains from interdependence.
The Americans followed this model into the Industrial Revolution, but abandoned it in the early 19th century favoring a non-critical thinking education that produces adults capable of repetition and imitation, but not innovation which separates Humans from every other species.
The issue is not genes. The issue is that education where it once came from parents and family with the goal to produce capable and independent young adults, capable of passing the ability to predict and coerce ones own future on, has now become a mishmash of memory and cooperation exercises.
If we simply make the goal of our local schools to compliment the parents responsibility to raise children into Independent Adults, then this trend will abate itself.
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