There was a case of a French man who suffered from extreme hydrocephaly. He lived a normal life, despite an IQ of 75, was married with two children, and held a

There was a case of a French man who suffered from extreme hydrocephaly. He lived a normal life, despite an IQ of 75, was married with two children, and held a career as a civil servant. “It is hard for me [to say] exactly the percentage of reduction of the brain, since we did not use software to measure its volume. But visually, it is more than a 50 to 75 per cent reduction,” says Lionel Feuillet, a neurologist at the Mediterranean University in Marseille, France. https://www.newscientist.com/article/dn12301-man-with-tiny-brain-shocks-doctors/ https://www.newscientist.com/article/dn12301-man-with-tiny-b...