IJR News — today's news from every side

IJR News — today's news from every side

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Narwhal Tusk Reveals Double-Helix StructureLifestyle — Aug 28, 2026New 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.