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What methods do they use and how do these methods work?

In this article, we will examine the methods by which scientists use radioactivity to determine the age of objects, most notably carbon-14 dating.

Unlike other proteins, which undergo constant recycling and replenishment, crystallines remain stable throughout a person’s life; they are envelopes sealed at birth, their contents an artifact from the womb.

And, if crystallines are the envelopes, then carbon-14 is the postmark.

Not long after the study was published, Heinemeier received a request from police in Germany. In the city of Wenden, near Cologne, a teen-ager had opened his family’s freezer in search of a snack and discovered the bodies of three infant girls, wrapped in plastic.

Heinemeier told him about his recent breakthrough in the murder case and suggested that Steffensen return to Greenland and bring back some lenses. Though sharks do possess crystallines in their eyes, acquiring enough samples for a rigorous study was an expensive and logistically tricky proposition; at first, Steffensen managed to get just two.

Hearing this at one of Steffensen’s lectures, Nielsen, a young biology student, proposed a solution.

Its life history is a black box, one that researchers have spent decades trying in vain to peer inside. What is their global range and population structure? A study begun in the nineteen-thirties suggested that the species’ lifespan might well be extraordinary, based on the slow growth rate of a single shark that a scientist was lucky enough to catch twice. To determine age in other sharks, biologists count the growth rings on their fin spines and vertebrae.

But Greenland sharks have no hard tissues in their bodies; even their vertebrae are soft. The mystery might have lingered were it not for the work of three Danish scientists—a physicist named Jan Heinemeier and two marine biologists, John Fleng Steffensen and Julius Nielsen.

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