It is a terrible thing to write off a human being as incapable of progress. It is an even more terrible thing to write off an institution, or a country, or a people as incapable. To do so, ...
The only thing that is more terrible than writing off a human being, or a people, is assuming that some brains have an advantage over others.
The brain is made up of up to a 100 billion neurons. A neuron is a nerve cell, dedicated to one thing only: processing electric signal and delivering it to another. Each neuron has multiple inputs, and a single output. It is a recurring theme in the nervous system, that it does not matter how many inputs there are, there is usually a single output. Sometimes a single neuron may have hundreds of thousands of inputs, microscopic tendrils of nanometric dimensions gathering signal from hundreds of thousands of other nerve cells, and handing the processed information to one nerve cell in networks that are complex beyond imagination.