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A 7,000-year-old man whose bones were left behind in a Spanish cave had the dark skin of an African, but the blue eyes of a Scandinavian. He was a hunter-gatherer who ate a low-starch diet and couldn’t digest milk well — which meshes with the lifestyle that predated the rise of agriculture. But his immune system was already starting to adapt to a new lifestyle.
Researchers found all this out not from medical records, or from a study of the man’s actual skin or eyes, but from an analysis of the DNA extracted from his tooth.
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A progression of sketches shows how a skull and genetic clues were combined to come up with the look of a 7,000-year-old hunter-gatherer who lived in Spain.
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James' World 2 
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