Of course he's expressing an opinion. He says we don't know how to raise cognitive ability. That is just not true.
Better to call these "skills". One can obviously raise skills, e.g. teach people to program. But no strong evidence one can raise GCA.
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How does average improve over time?
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Seems people here are confusing relative cognitive abilities and absolute cognitive abilities-The idea you can’t raise the latter is bizarre
End of conversation
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