Where They Went

Using DNA, anthropologists hope to solve the puzzle of what happened to the people of an ancient city-state located in what is now Mexico. The city, Xaltocan, became part of an alliance that eventually grew and became the Aztec empire. But what happened to the Otomí people who lived there "is an anthropological cold case," Nature News says.

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Publication of He Jiankui's work on gene-edited infants would raise ethical concerns for journals, Wired and others report.

The New York Times reports that evidence linking trauma in one generation to epigenetic effects that influence subsequent generations may be overstated.

ScienceInsider reports that US National Institutes of Health researchers were told in the fall they could not obtain new human fetal tissue.

In PNAS this week: skin pigmentation evolution among KhoeSan, biomarkers for dengue virus progression, and more.