A Sea Worm’s Incredible “Bio-Metal” Jaws May Belong to an Entirely New Class of Material

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A sea worm’s metal-like jaws may represent an entirely new class of natural material. In the classic guessing game “20 Questions,” imagine asking “animal, vegetable, or mineral?” to help narrow down the answer. For the ancient sea worm Perinereis cultrifera (which is still around to this day), the answer is surprisingly complicated. This species and [...]