The Indigenous peoples of the Bolivian highlands are survivors. For thousands of years they have lived at altitudes of more than two miles, where oxygen is about 35 percent lower than at sea level.
A braided stream, not a family tree: How new evidence upends our understanding of how humans evolved
Evidence is mounting that the evolution of our species is more convoluted than we imagined — more like a braided stream than a branching tree. Our species is the last living member of the human family ...
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