"Son, what you've got there's nothing but a big swim bladder!" "A what?" "A swim bladder. That's how most kinds of fish get rid of their CO2. Their gills don't do it; they just bring in oxygen. Instead, they've got this nest of real small veins---capillaries---around the bladder. Blood flows through it and the CO2 gets filtered out." "Never heard of it before. Guess I thought the gills did that. I'll bet it's got a Latin name." "Yep. It's better than 'bladder,' too. Rete mirabile. Means 'wondrous network.'"

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