Sponges: The Ghost in the SaltA brilliant method for engineering absorbency.

From the show

Why it looks like that

The porous structure of a household sponge is no accident. It’s created through a surprisingly simple yet clever manufacturing process involving cellulose and salt crystals. By heating a mixture of the two, the salt melts and drains away, leaving behind a network of interconnected pores. The size of the salt crystals determines the size of the holes, allowing manufacturers to create sponges for any task.