“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 were a two-week-dead lark, and pulled it out of its cover.
“You press the 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.
I think it’s funny that I read about this “sort of electronic book”, described in The Hitchhiker’s Guide to the Galaxy in 1979, on my smartphone’s Kindle app in 2012.