There is no invincible fabric that can withstand spills of curry or splashes of mud, but there is a creature in nature that has this ability: the very familiar "Den-den-mushi-mushi snail," a familiar nursery rhyme.

Snails appear out of nowhere when it rains. Their trademark shells as they crawl around lazily have long been a familiar feature of the rainy season.

Snails are a type of gastropod that originally lived in water. Although they expanded their habitat onto land by evolving the ability to breathe with their lungs, their soft bodies, which are characteristic of mollusks, do not like to dry out. For this reason, they prefer to live in moist places, and their shells protect them from drying out.

The snail's shell is also an organ that protects the heart and other important internal organs. When a baby snail hatches from an egg, it has a thin, small shell with about one and a half spirals. As the snail grows, the number of spirals increases, and at that time, fine grooves called growth lines are engraved on the surface of the shell, just like the annual rings of a tree.

Now, since snails live in humid environments, you would expect their shells to get covered in mud and debris, but it's rare to see a dirty snail.

In fact, research has revealed that snail shells have a mechanism that makes them extremely resistant to dirt.