Mysterious Species May Have Interbred With Humans

The history of human evolution keeps getting more complicated.

Researchers this week announced the discovery of a thigh bone that could serve as evidence of a new branch in the our family tree. The femur was dated to around 14,000 years ago, challenging the notion that other species of ancient humans died out after modern humans appeared. Instead, this find suggests that our distant cousins may have co-existed with several other species of hominins for quite some time.

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