sillyboy wrote:
A theory argues that racial differences can lead to differences in cranial size and, in turn, brain size. However, another study suggests thathumans who grow up farther from the equator are exposed to less ambient sunlight and therefore develop larger eyes, which in turn lead to larger visual cortices, increasing total brain size . Since the populations of some races are concentrated closer to the equator and the populations of other races are concentrated farther from the equator,data that appear to support the racial theory of brain size may fit the ambient-light theory of brain size equally well or even better.
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