When he shone white light into an empty shell, the structure scattered only blue-green wavelengths (the same ones given off by snail’s shining cells); all the other colours passed straight through.

Scientists can use ultraviolet light to draw out the color patterns of these ancient, white-washed shells. Accessibility statement Skip to main content Democracy Dies in Darkness ...

Hundreds of “sea potatoes”—actually the empty shells of a species of sea urchin—mysteriously washed up on Cornish beach last weekend Katherine J. Wu - Correspondent August 15, 2018 ...