Our expert says:
Various factors influence it --- inheritance, upbringing ( both in terms of intelleictual stimulation and opportunities to learn and physical health and nutrition). But as I said in reply to your other question, IQ isn'tthe beginning and end of it all. There are people with high IQ who are lazy or antisocial, and never achieve anything worth a cent, and others with lower IQ who achieve a great deal, for themselves and others, because they work hard and keep trying.
Oh, and John may be right considering the last time, in the dim and distant past, when my IQ was measured at school !
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