And I could express this with an athletic analogy. Imagine I’m running a
gym and we have all of these different athletic tests. So, we have a
running test, we have a basketball shooting test, a swimming test,
fencing, a list of ten of them. Now, each of you go through each of the
tests and then you’ll each get ten scores. But what we’ll discover is
that the scores are not independent of one another. People who are good
at one athletic thing tend to be good at another. If there’s somebody
who’s really good at running and swimming, odds are they’re probably
pretty good at climbing. And the same thing holds for IQ, which is above
and beyond how good people are at specific things there seems to be a
factor as to how well they are in general. And this factor is known as G.
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