Photo: National Park Service
Over the last 25 years, while there has been a revolution in our understanding of how and when the first humans arrived in the Americas and who they were, there still are blank spots, which this article explores in depth. In 2014, geneticists sequenced the 24,000-year-old remains of a boy who died at Lake Baikal and concluded that people related to him contributed 10-15% of the ancestry of modern Europeans and 40% of the ancestry of Native Americans. In 2015, the same geneticists found that some Amazon tribes were tied them more closely to Australian Aboriginals and Papuans than Siberians. The genetic influences in eastern Siberians and the Inuit, who arrived to the Arctic long after the Ice Age, are not present in Native Americans because their Beringian ancestors were sealed off from Eurasia.
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