Human beings have a conflicted relationship with the Sun.
For most people, the skin becomes gradually darker as specialized cells kick into action to produce aThis remarkable molecule absorbs most visible light, causing it to look very dark brown, almost black. Eumelanin also absorbs damaging ultraviolet radiation.
People who lived under strong UV light – like you'd find near the equator – year in and year out had darkly pigmented and highly tannable skin capable of making a lot of eumelanin. With only their feet to carry them, our distant ancestors didn't move around much during their lives. Even for people with lightly pigmented skin, painful sunburns would have been exceedingly rare because there was never a sudden shock of strong Sun exposure. Rather, as the Sun strengthened during spring, the top layer of their skin would have gottenThis is not to say that the skin would have been undamaged by today's standards: Dermatologists would be appalled by the leathery and wrinkled appearance of the sun-exposed skin of our ancestors.
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