"The Hitchhiker's Guide to the Galaxy. It's a sort of electronic book. It tells you everything you need to know about anything. That's its job."
Arthur turned it over nervously in his hands.
"I like the cover," he said. "Don't Panic. It's the first helpful or intelligible thing anybody's said to me all day."
"I'll show you how it works," said Ford. He snatched it from Arthur who was still holding it as if it was a two-week-dead lark and pulled it out of its cover.
"You press this button here you see and the screen lights up giving you the index."
A screen, about three inches by four, lit up and characters began to flicker across the surface.
"You want to know about Vogons, so I enter that name so." His fingers tapped some more keys. "And there we are."
The words Vogon Constructor Fleets flared in green across the screen.