The breath you just took contains about 21 percent oxygen. But if you were in a chamber with no influx of fresh air, the oxygen level would slowly diminish. If it got to about 15 percent, you’d feel a ...

Naked mole rats will never win a beauty pageant, but they win at life by being the longest-living rodents. Researchers found that the secret of these burrowing animals lies in a protein that does the ...