The Babel Fish

Douglas Adams was born in Cambridge, England, in 1952, The "Babel fish" appears in his hilarious "trilogy" The Hitch Hiker's Guide to the Galaxy It was first a British radio programme in 1978, which later became a book and a television programme. It is a science fiction story about an Englishman called Arthur Dent who gets on a spaceship just before the Earth is destroyed, and the adventures he has in space with the other characters on this spaceship. For intergalactic communication, a fish inserted in the ear is used as an automatic translation device. Its function is explained in the following passage, in which a speaking guide book provides the information. - Douglas Adams, The Hitch Hiker's Guide to the Galaxy.  A Trilogy in Four Ports (London: Heinemann, 1987), 51ff.

"What's this fish doing in my ear?"

"It's translating for you. It's a Babel fish. Look it up in the book if you like."

He tossed over The Hitch Hiker's Guide to the Galaxy. [. ..]

"The Babel fish, " said The Hitch Hiker's Guide to the Galaxy quietly, "is small, yellow and leech-like, and probably the oddest thing in the Universe. It feeds on brain wave energy received not from its own carrier but from those around it. It absorbs all unconscious mental frequencies from this brainwave energy to nourish itself with. It then excretes into the mind of its carrier a telepathic matrix formed by combining the conscious thought frequencies with nerve signals picked up from the speech centres of the brain which has supplied them. The practical upshot of all this is that if you stick a Babel fish in your ear you can instantly understand anything said to you in any form of language. The speech patterns you actually hear decode the brainwave matrix which has been fed into your mind by your Babel fish. [...]

Meanwhile, the poor Babel fish, by effectively removing all barriers to communication between different races and cultures, has caused more and bloodier wars than anything else in the history of creation."

Vocabulary

Babel (n.): the confusing sound of many voices talking together - leech (n.): a small soft creature that fixes itself to the skin of animals in order to drink their blood -  carrier (n.): something used for carrying something -  unconscious (adi.): unable to see, move, feel, etc. in the normal way because you are not aware of it - nourish (v.): feed - excrete (v.) (formal) to get rid of waste material from your body through your bowels, your skin, etc. -  telepathic matrix: a living substance which sends out thoughts -  upshot (n.): result