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It’s probably the happiest root canal ever: Molecular archaeologists reported last January that they had drilled into a 10,300-year-old human tooth discovered in Alaska and extracted genetic gold. The molar, recovered from skeletal remains found in 1996 in On Your Knees Cave, located on Prince of Wales Island off southern Alaska, holds the oldest genetic sample ever recovered in the Americas. That sample supports the theory that humans first arrived here about 15,000 years ago and then migrated
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