"In an investigation recently published in
Science, a team of researchers used radiocarbon dating to put together a timeline of the Greenland shark's lifespan," writes
ARSTechnica. "Because Greenland sharks lack bones—they’re cartilaginous
fish—conventional methods of tracking growth, like carbon dating of
bones, won't work. Instead, the team used a modified radiocarbon dating
technique that has worked before on other boneless animals: tracking the
chronology of the eye lens. The eye lens nucleus is composed of inert
proteins. The central portion of the lens is formed during prenatal
development, and during growth, the tissue retains the original
proteins, which were largely made before birth."
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