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Tropical Humans

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Swan princess, John Bauer (1882-1918). Human head hair is of relatively recent origin, reaching incredible lengths in some groups but not in others. Credit: Wikimedia Commons
I've published an article on the evolution of long head hair in humans. The following is the abstract: In many humans, head hair can grow to a much greater length than hair elsewhere on the body. This is a "derived" form that evolved outside Africa and probably in northern Eurasia. The ancestral form, which is... Read More
Hadza men are smaller, less robust, and less aggressive than the more polygynous Datoga. Credit: Wikimedia Commons
Humans differ in paternal investment—the degree to which fathers help mothers care for their offspring. They differ in this way between individuals, between populations, and between stages of cultural evolution. During the earliest stage, when all humans were hunter-gatherers, men invested more in their offspring with increasing distance from the equator. Longer, colder winters made... Read More
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