This Week in PNAS

In the early, online issue of PNAS this week, Canadian and American researchers report that turkeys were domesticated at least twice in North America. Based on their analyses of ancient mitochondrial DNA from 149 turkey bones and dozens of dung samples from archaeological sites in the US combined with comparisons of modern samples and GenBank data, the team found that a now extinct domesticated turkey sub-species once existed in the American southwest.

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In a survey, about half of Canadian government scientists say they still feel as though they cannot speak freely, ScienceInsider reports.

The Atlantic reports that biohacker Josiah Zayner regrets injecting himself with the CRISPR gene-editing tool on stage.

Clinicians in China are moving ahead with a number of CRISPR trials, NPR reports, as the US embarks on its first.

In Nature this week: genomic approaches applied to study Neolithic and Bronze Age Europeans, and more.