Since humans developed the ability to study DNA extracted from fossils, we have uncovered a mystery that until now had no answer. In the DNA of some human species, including our own, Homo sapiens, there were “super-archaic” markers, vestiges of older, unknown species with which we had interbred and produced offspring. Unable to determine who these genomic intruders were, some scientists called them ghost populations.

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One of the 'Homo erectus' molars analyzed. Publicado por:​EL PAÍS Edición América: el periódico global

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