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Skin has changed color in human lineages much faster than scientists had previously supposed, even without intermarriage, Jablonski [i.e. Nina Jablonski, head of the Penn State Department of Anthropology] says. Recent developments in comparative genomics allow scientists to sample the DNA in modern humans. She says that for many families on the planet, if we look back only 100 or 200 generations (that's as few as 2,500 years), "almost all of us were in a different place and we had a different color."
"People living now in southern parts of India [and Sri Lanka] are extremely darkly pigmented," Jablonski says. But their great, great ancestors lived much farther north, and when they migrated south, their pigmentation redarkened.
"There has probably been a redarkening of several groups of humans."
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