This Week in Nature

Researchers led by the University of Copenhagen's Eske Willerslev report in Nature that they have sequenced an ancient horse — the oldest creature to be sequenced — along with a number of other, related species. The ancient horse, between 560,000 years and 780,000 years old, was sequenced to 1.12 times using the Illumina and Helicos platforms.

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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.