It's Good to Be Transparent
[Of jellyfish:] Their bodies are 99 percent water; they have fewer non-aqueous ingredients than lemonade. But they've been around for 700 million years. Armored trilobites, thunder-footed dinosaurs, and saber-toothed tigers have come and gone; the watery jellyfish endure. They have outlasted animals with bulk and brains. Their strategy for survival has been spectacularly successful: Keep it simple, go with the flow.
[Chet Raymo, "Go With the Flow", Science Musings Blog, 29 June 2005.]