But, upon carefully cracking that spiny shell, you'll see five orange, sponge-like "tongues." Though these tongues are often believed to be roe, the edible parts of the sea urchin are actually its ...

The next time you spot a sea sponge, say “gesundheit!” Some sponges regularly “sneeze” to clear debris from their porous bodies. It’s “like someone with a runny nose,” says team ...