Nature produces human beings with all kinds of talents. Noone is equal, but all deserve equal chances of development. A hierarchy can be deadly for a society. Society develops in a constant revolution, or evolution. Mutants and cyborgs are fiction. It doesn't work that way. People don't change that much in 10.000 years. Our forefathers were as intelligent like we, but they had less opportunities. BTW.. I still think it's possible that mankind even gets more stupid every day... At least if I see what is going on in the world of today.