Most of us are familiar with the narwhal, a bizarre arctic mammal that sports a long, twisted tusk, earning the creature its nickname, the unicorn of the ocean. A cursory glance at the tusk reveals that it twists to the left. But there’s more to this spiraled structure than meets the eye.
Scientists used to think the tusk—which is really a tooth—was simply a straight protrusion that spiraled only to the left. He…
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