In response to a post at Nature's Nautilus that scoffs at papers with more than 20 contributing authors, blogger RPM points out that some disciplines need a lot of people to complete a project. In genome sequencing projects, RPM says, several people take part in proposing the idea, actually sequencing the genome, assembling it, and analyzing the sequence.

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

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