This Week in Nature

In Nature this week, a team of German researchers report on the discovery that microRNA-34a is induced in the aging heart, and that in vivo silencing or genetic deletion of the small, non-coding RNA reduces age-related cardiomyocyte cell death. Additionally, inhibition of the miRNA reduces cell death and fibrosis following heart attack and improves recovery.

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Vivek Murthy is no longer the surgeon general of the US, the Associated Press reports.

People around the globe took to the streets to support science — some with signs.

Parents who learn of their increased genetic risk of disease also contend with telling their children about theirs, the New York Times writes.

In PLOS this week: loci linked to body mass index measurements, long non-coding RNA expression and urothelial carcinoma prognosis, and more.