X-rays add new twist to narwhal’s spiral tusk - arstechnica.com

“Researchers used high‑resolution X‑ray imaging to reveal a previously unknown double‑helix structure inside the narwhal's iconic straight tusk. The discovery explains how the tusk resists bending and fracture despite its length, offering clues about the material’s unique combination of stiffness and flexibility. For U.S. industries, the findings could inspire new lightweight, high‑strength composites for aerospace, marine, and medical devices. Why It Matters: This breakthrough highlights a natural design that U.S. engineers can emulate to reduce material costs and improve performance in critical applications, potentially giving American manufacturers a competitive edge in advanced materials technology.”