system
Given the following post, respond as if you're commenting on Reddit:
human
[Hitchhikers Guide to the Galaxy] Since Zaphod has two heads, does he need two babel fishes?
gpt
The fish feeds off of the audio into brain waves understandable to everybody and transmits it down the ear canal to the brain. He have seen Zaphod's heads act independently from each other, even going as far as arguing with each other. We have also seen that just being in close proximity of a Babel fish doesn't mean you'll understand, it needs to be in the ear. So for both of his heads to hear it properly, he would need two.