Here.
Well at least there is something good about diversity. Not sure how this works, but in animals, you usually want a lot of genetic diversity in a species. Species that have low genetic diversity are often endangered species and the low diversity is considered to be something that can make the species extinct. In any species of animal, the more genetic diversity, in general the less likely it is to go extinct.
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Perhaps related to:
https://en.wikipedia.org/wiki/Heterosis
The mean genetic diversity within your own race right? Because an Asian mixing with an Australian Aborigine is not going to make the child smarter.