U.S. researchers say the trick sea urchins use to keep their teeth razor-sharp could lead to tools for humans that never need sharpening or honing.
Sea urchins can use their teeth to eat into stone, creating pockets where they can hide from predators and protect themselves from crashing waves. Researchers at the University of Wisconsin-Madison say despite constant scraping and grinding into rock, urchin teeth never get dull, a university release said Wednesday.