Scientists have never agreed on when humans began wearing clothes and estimates suggested by various experts have ranged greatly, from 40,000 to as many as 3 million years ago. Recent studies by Ralf Kittler, Manfred Kayser and Mark Stoneking—anthropologists at the Max Planck Institute for Evolutionary Anthropology—have attempted to constrain the most recent date of the introduction of clothing with an indirect method relying on lice. The rationale for this method of dating stems from the fact that the human body louse cannot live outside of clothing, dying after only a few hours without shelter. This strongly implies that the date of the body louse's speciation from its parent, Pediculus humanus, can have taken place no earlier than the earliest human adoption of clothing. This date, at which the body louse (P. humanus corporis) diverged from both its parent species and its sibling subspecies, the head louse (P. humanus capitis), can be determined by the number of mutations ea...
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