Human beings are experts at recognizing the identity of their fellow humans due to their ability to discriminate based on our varying shapes, colors, and sizes. Although most of the variation we use to recognize each other is found in external features of the body, such as height, weight, eye color, hair length, and skin tone, a large portion of human variation is contained in the skeleton. These variations originate from the person's age, geographic origin, sex, or simply the idiosyncrasies of an individual's genetics and environment.
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