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Narwhal Tusk Reveals Double-Helix StructureLifestyle — 4dNew imaging shows narwhal tusks are not a simple spiral but consist of a double-spiral structure with outer left-handed cementum and inner right-handed dentine that counterbalance growth stresses, giving the tusk its toughness and enabling extreme length. Researchers also note the tusk’s long cultural history, from medieval Unicorn Horn lore and monarchs’ coronation chairs to ongoing questions about its original biological purpose.