This Week in PLOS

In PLOS Genetics, the University of California, Santa Cruz's Beth Shapiro and colleagues from the US, Russia, and Canada present evidence for a relatively straightforward model for polar bear evolution. Using genomic sequence data on seven polar bears, one black bear, one mainland brown bear, and one brown bear from Alaska's Admiralty, Baranof, and Chichagof, or ABC, islands, the team uncovered an over-representation of polar bear sequences on the ABC brown bear X chromosome.

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The New York Times and ProPublica look into the close relationship between a startup and Memorial Sloan Kettering Cancer Center.

Yahoo News reports millions of dollars are being transferred from NIH, CDC, and other programs to pay for the housing of detained undocumented immigrant children.

In Science this week: in vitro generation of human reproductive cells, and more.

Researchers gave a handful of octopuses MDMA to find that they too act more social on the drug, Gizmodo reports.