Helicoprion: The 270-Million-Year-Old Shark With a Buzz Saw for a Jaw
For more than a century, a single spiral of teeth has taunted paleontologists with a maddening question: where in the world did it go in the mouth? The animal behind that riddle – Helicoprion – swam Earth’s seas long before dinosaurs, yet its legacy feels strangely modern, like a design brief left on a lab ...
