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I'm just going to say here IQ tests, I don't put up much value on IQ tests. But anyways, doctors soon discovered that the man was living with a brain that was about least half the average size. They also found a large build of a fluid which allowed very little tissue development. Essentially, he had a thin sheet of brain tissue pushed up against the skull. The fluid built up likely caused the leg weakness. Stop it. And the fluid was then drained which allowed him to recover some leg strength at that point. The case was published in the Lancet. The new shunt was placed in the skull and within a few weeks his neurological baseline returned. And over the evolution of humans, our brains became larger compared to those of our brains. This led to improved cognitive ability and language. Why our brains grew? No one really knows. Possibly environmental and dietary factors played a big part in that.