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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Labs in the US and South Korea are hoping to bring the woolly mammoth back from beyond extinction, Newsweek writes.

Geneticist Adam Rutherford speaks with National Geographic about paleogenetics, race, and more.

Researchers link genetic links between education and smoking and longevity.

In PNAS this week: influence of gene environment interactions on polygenic traits, epigenetic features affecting fruit fly foraging, and more.