Protruding forehead (usually without hair) is a physical indication of intelligence?

No. There is no relationship between the size or shape of the head (with or without hair) and intelligence. One cannot accurately guess a person's IQ by looks or even by scanning instruments such as mri, spect, or pet. Some genetic syndromes with striking physical features do predict intelligence, but almost always in the form of increased risk for mental retardation.

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