Does intellectual ability make us human? Or self-consciousness? Or the possession of a soul? Or tool-making? Or private property? Or genetic inheritance? Whatever definition we choose, it excludes some creatures we might want to include in the "human."
While the top of the economic pyramid may be dominated by a few players, the knowledge pyramid is inversely skewed, with just 0.2% of the world's population possessing a full 80% of our languages, and the vast knowledge they encode.