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He and his co-authors did note, however, that their lens technique might be useful in the field of forensics.

For some fishermen, a biologist recently told me, netting a Greenland shark is about as welcome as stepping in dog poop. It is among the world’s largest predatory sharks, growing up to eighteen feet in length, but also among its most elusive.With the help of a mathematical model that linked size with age, they estimated that one sixteen-foot female was at least two hundred and seventy-two years old, and possibly as much as five hundred and twelve years old.Because it is difficult to establish background carbon-14 levels in the ocean, and because Nielsen and his colleagues didn’t know which part of the ocean the sharks had been born in, the figure was inexact.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, Steffenson managed to get just two.Hearing this at one of Steffensen’s lectures, Nielsen, a young biology student, proposed a solution.

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