In fact, an information theory that leaves out the issue of noise turns out to have no content. - Hans Christian von Baeyer

We don't know what energy is, any more than we know what information is, but as a now robust scientific concept we can describe it in precise mathematical terms, and as a commodity we can measure, market, regulate and tax it.

If quantum communication and quantum computation are to flourish, a new information theory will have to be developed.

Numbers instill a feeling for the lie of the land, and furnish grist for the mathematical mill that is the physicist's principal tool.