The hair on our heads serves the same function as hair in other primates. It helps cool the body by absorbing heat from the sun and providing a place underneath where our sweat can keep the skin somewhat moist (again for cooling). In the cold, hair helps keep the body warm. When you have a large brain it is very important not to let it overheat. A more relevant question is why we lack hair on most of the rest of our bodies. One theory is that we began wearing clothing made from plant fibers relatively early, which may have lended an advantage to hairlessness due to less problems with disease carrying insects. Another theory, known as the thermoregulation theory, is that our ancestors ran around alot and the lack of hair further assisted in cooling.
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