Amos, a well tested genius showed in scans that his brain was in fact 18% smaller than the average brain.

ergo I believe: While we all are a product of what we learn and the people we know...
The secret is in the quality of experience and the wiring of these experiences in the brain and has little to do with the quantity of neurons.

If a neoron were a city a superior brain will have more bridges for its cities. Merely having more cities with fewer roads in and out is not an advantage.