not surprised about IQ being 80% determined by genetics ... i’ve repeatedly noted that very intelligent parents tend to sire intelligent offspring ...
i’ve also noted that very intelligent folks excel whether they be a self-employed electrician or a self-employed arborist ...
I maewe it 2 hear...mus be somtin hear....
Yes, but one should not underestimate the impact of "regression to the mean" (cited above).
Two genius-level parents will have children whose intelligence is shifted slightly to the right on the bell curve. The chances of any single child also being a genius is maybe only twice that of a child selected at random from the general population (i.e.: the chance shifts from "very low" to only "low").
It is vital that high-I.Q. parents bear this fact in mind.
Regards,