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  1. American physician John Harrison in 1825 described the results of his measurements of human skulls, showing that the size of the brain can not be determined only by determining the volume of intracranial space. This was one of the decisive objections to phrenology. Accordingly, all the theories that try to draw some significant conclusions about intelligence from the external features of the skull are not valid (but within certain limits, it is clear that if the size of the skull shows that the brain that was in it should differ significantly in shape and size, then it is already possible to draw some conclusions, anthropologists draw about our ancestors,

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