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Everyone outside subsaharan Africa and Papua has a skin type that is too light for its latitude. Ancient DNA evidence has proven that everyone outside Africa originally had a skin color that was dark brown to black, even above the 50th parallel, and that artificial selection lightened it to an unnatural degree over the last ~5000 years.
Also, the genetic mutations and folate degradation that accumulate from UV exposure happen during adolescence and are passed on to your offspring. The median age of skin cancer diagnosed patients is also decreasing.
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