A 500-year-old shark, a $7 million study, and a baffling disappearance—what happened? Scientists spent years tracking Greenland sharks, one of the longest-living vertebrates on Earth, in an effort ...

One shark, measuring five meters, was found to be at least 272 years old, with an upper age estimate of more than 500 years (392 +/- 120 years). Such findings have remarkable implications for the ...