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In a new study in PNAS, researchers at Penn State and the University at Buffalo say their analysis of polar bear DNA has led them to extend to origin of the species back to five million years instead of 600,000 years, reports The New York Times' James Gorman.

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The US Centers for Disease Control and Prevention has identified a small group of breakthrough COVID-19 cases, the Wall Street Journal reports.

The New York Times reports that the US Department of Defense is to use genetic genealogy approaches to identify the remains of unknown soldiers.

Vox and Nature discuss the importance of preparing for the next pandemic.

In Nature this week: comparison of five circulating tumor DNA assays, resequencing analysis of lettuce gives insight into its domestication, and more.