X-rays add new twist to narwhal's spiral tusk

New study finds that the tusks have not one but two spirals, twisting in opposite directions. https://arstechnica.com/science/2026/08/x-rays-add-new-twist-to-narwhals-spiral-tusk/?utm_brand=arstechnica&utm_social-type=owned&utm_source=mastodon&utm_medium=social