If you’ve ever explored the shores or tidal pools of our ocean, chances are you’ve spotted some small, cone-shaped shells clinging to rocks. These are sea snails called limpets, and they are far more resilient and important than they may appear.  To feed, limpets use a tongue-like organ called a radula. The radula is covered in rows of tiny teeth, each measuring less than a millimeter in length. The remarkable strength of limpet teeth stems from their structure, which is made of chitin—a primary material in the exoskeletons of insects and crustaceans—and reinforced by the mineral goethite. Researchers in the U.K. have found that goethite is the strongest known biological material on Earth and is even stronger than Kevlar. Limpets use their incredibly sturdy teeth and radula to scrape algae off rocks with ease, earning them the nickname the “bulldozers of the seashore.” To move across rock formations, limpets utilize tidal movements and their strong muscular “foot.…