One of my favorite writers of all time, Douglas Adams has a neat little plot device in that wholly remarkable book ‘The Hitch Hikers Guide to the Galaxy’, called the Babel Fish. Let me quote the master himself to explain the concept of the Babel Fish to you if you’re not already aware of it: “The Babel fish is small, yellow, leech-like, and probably the oddest thing in the Universe. It feeds on brainwave energy received not from its own carrier, but from those around it.
