A new study published in Nature shows that all that's needed to mend a "broken heart" is time — and stem cells, says Nature News' Marian Turner. The study shows that natural proteins can activate stem cells in mouse hearts to replace damaged muscle tissue after a heart attack, Turner says. Because cardiomyocytes can't be repaired after a heart attack, they need to be replaced.

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In a statement, National Institutes of Health Director Francis Collins says sexual harassment is "morally indefensible" and "unacceptable."

Octopuses might owe their intelligence to their liberal alterations to their genes, Cosmos reports.

Stat News and ProPublica report that African Americans are underrepresented in cancer clinical trials.

In Cell this week: genomic analysis of abdominal aortic aneurysm, effect of probiotics on the microbiome, and more.