‘Double Spiral’ Secret of Narwhal’s Twisted Tusk Revealed By High Tech X-Rays

Hidden secrets of the narwhal's twisted tusk have been revealed using the latest X-ray technology. Tusks of the species of whale native to the Arctic have long been the subject of myths—even being sold as ‘unicorn horns’ and believed to possess magical powers during the Middle Ages. Now, an international research team has solved the