It's in the DNA: Sharing 6 ancestors over 20,000 years

• Story Highlights
• Study: Most Native Americans can trace part of their ancestry to just six women
  
• Study: 6 women left DNA legacy; remains in 95 percent of Native Americans
  
• Study: The women lived between 18,000 and 21,000 years ago
  
• expert unconnected with study said findings leave some questions unanswered
  
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