Taking a trick from birds and butterflies, a mollusk shines blue using intricate structures that allow selective reflection of light. But unlike other animals, the blue-rayed limpet, a snail that ...

HRI's “Beachcombing” weekly series offers an opportunity to see strange, fascinating objects and species on the beach, but it also offers a window into the Gulf of Mexico.

Ptil Tekhelet sells tzitzit, or fringes attached to the corners of Jewish prayer shawls, colored with dye from the Murex trunculus snail Courtesy of Ptil Tekhelet/Moshe Caine Thousands of years ago, ...