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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CNN reports that researchers have tied a new variant to opioid addiction risk.

Organoids derived from patients' tumors may help determine what chemotherapy treatment patients would benefit from, according to New Scientist.

An initiative from GenomeAsia 100K hopes to increase the number of South Asians in genetic research, according to NBC News.

In Science this week: genomic analysis of ancient and modern horses indicates population turnover, and more.