When quantum-mechanical phenomena are taken into account, new vistas open up both for codemakers and codebreakers.

Thank you the marketing division of the Sirius Cybernetic Corporation, said Marvin and trudged desolately up the gleaming curved corridor that stretched out before them. Let's build robots with Genuine People personalities, they said. So they tried out with me. I'm a personality prototype. You can tell can't you?

The haubergeon, was a coat composed either of plate or chain mail without sleeves: the shirt of mail was much in the form of the shirts now worn, except that it had no sleeves, it was always of chain mail.

The second is that it has potentials for information exploration, because the displayed network is navigatable.