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

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.

In fact, an information theory that leaves out the issue of noise turns out to have no content.

In order to understand information, we must define it; bit in order to define it, we must first understand it. Where to start?

The switch from 'steam engines' to 'heat engines' signals the transition from engineering practice to theoretical science.

Science has taught us that what we see and touch is not what is really there.

Entropy is not about speeds or positions of particles, the way temperature and pressure and volume are, but about our lack of information.