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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US Attorney General Jeff Sessions is considering using DNA tests to determine relatedness between adult and child migrants, the Daily Caller reports.

Bloomberg reports that Brainstorm Cell Therapeutics plans to offer a treatment it is developing under the "right to try" law for hundreds of thousands of dollars.

In Nature this week: expansion of disease-resistance genes among long-lived oak trees, and more.

In a proof-of-concept study, researchers report being able to determine age from dried bloodstains, Discover's D-brief blog reports.