Mysterious 'ghost population' may have been among first Americans It’s a well-known fact that the first Americans crossed the Bering land bridge from Siberia to Alaska at some point less than 23,000 years ago. However, new research from deep within the Amazon suggested that a mysterious, previously unknown “ghost population” crossed over at some point as well. According to a new report in the online journal Nature, DNA evidence has revealed that two Amazonian tribes – the Surui and the Karitiana – are more closely related to Papua New Guineans and Aboroginal Australians than they are to Native Americans.
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