Jellyfish have radial symmetry, meaning that if you sliced a jellyfish down the middle, the parts would be symmetrical, like the segments of an orange. These cnidarians are famous for their stinging ...

Although a few kinds of jellyfish can cause life-threatening stings, mostly it just burns, swells, itches, and leaves tracks along your skin. Here's how you treat it Rinse your skin in salt water.