Add a perspective of IQ of separated monozygotic twins
https://www.sciencedirect.com/science/article/pii/S019188692....
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UPD and this one https://link.springer.com/chapter/10.1007/978-94-011-6129-9_...
https://www.sciencedirect.com/science/article/pii/S019188692....
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UPD and this one https://link.springer.com/chapter/10.1007/978-94-011-6129-9_...
Which makes sense - how many identical twins are separated at birth? Even if they were, it is unlikely one would be sent to Cambridge and one to rural Nepal (one of the lowest places for these IQ studies).