German researchers are working on scaling down the size of the magnets needed to NMR machines, reports Technology Review. RWTH Aachen University's Federico Casanova and his colleagues have made a magnet that "is about the size of a standard D battery and weighs 500 grams," according to Tech Review.

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Senator Elizabeth Warren (D-Mass.) has released the results of a genetic ancestry analysis, the Boston Globe reports.

Retraction Watch's Ivan Oransky and Adam Marcus report that Harvard Medical School and Brigham and Women's Hospital have recommended that more than 30 papers from a former researcher be retracted.

Thomas Steitz, who won the 2009 chemistry Nobel Prize for his ribosome work, has died, the Washington Post reports.

In PLOS this week: mechanisms for genes implicated in coronary artery disease, rumen microbes and host genetics influence cow methane production, and more.