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Ed Dutton discusses the problems of biracial kids (those who have parents of 2 different races). Multiple large studies show that biracial kids have various behavioral problems in excess, not seemingly related to IQ.https://www.youtube.com/watch?v=3s3U64VUYg4 …
If you're wondering about the qualification, it's because one might also calls kids of two mixed race parents for biracial. The genetic admixture works out to the same, but the social situation does not.
