This is an example of how twin studies can help decide whether genetic or environmental factors are causative.
One concern about these studies is that I have yet to learn the specifics of how much contact twins reared apart have with each other. Are they aware that there is a brother or sister that is closely related to them. It's sort of like the cliche movies and stories when identical twins meet by happenstance. Who would rear identical twins apart?? That is some unusual.
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