The texture of human hair from 1885
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Human hair is usually categorized ethnically into three major distinct groups: European, Asian, and African.

A comparison of some general physical characteristics of hair from different races.
European – Generally straight or wavy. Oval or round of moderate diameter with minimal variation.
Asian – Straight. Round with large diameter.
African – Kinky, curly, or coiled. Flattened with moderate to a small diameter and considerable variation.