Whites and blacks have substantially different maturation rates. Gestation is substantially different, leading to more "preterm" blacks
This is why the arguments about "but there's no gap at age 2" (or whatever) is worthless. Speed of maturation and endpoint are uncorrelated.
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For what it's worth, chimp babies test ahead of humans at 6 months. Why are chimp mothers so bad that they allow such a gap later?
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Should the government step in to raise all chimp babies, in an effort to reduce the gap?
End of conversation
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