A technology developed by the Nok.

Famous for the distinctive terracotta sculptures of human heads and figures, Nok was the first known culture in West Africa to produce such art and perhaps the first sub-Saharan culture to perfect iron-smelting technology.

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the noble might have thought that the system was far because they had lot of things and riches and the serf would have thought that the feudal system was un fair because of the way they were treated.