Researchers are turning to a variety of techniques to bring back the American chestnut tree, NPR reports. The chestnut used to make up a quarter of hardwood forests on the East Coast, but it was brought low in the early 1900s by a fungus carried by imported Chinese chestnut trees.

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John Mendelsohn, a former president of the University of Texas MD Anderson Cancer Center, has died, the New York Times reports.

Chinese state news agency Xinhua reports that a preliminary investigation has found He Jiankui performed his gene-editing work illegally.

Identical twins receive different estimates of ancestry from the same direct-to-consumer genetic testing firms, CBC reports.

In PNAS this week: chromosomal features of maize, adaptations in the vinous-throated parrotbill, and more.