The problem of defining exactly what is meant by the signal velocity, which cropped up as long ago as 1907, has not been solved.

An electron is real; a probability is not.

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

Underneath the shifting appearances of the world as perceived by our unreliable senses, is there, or is there not, a bedrock of objective reality?

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

The problem of defining exactly what is meant by the signal velocity, which cropped up as long ago as 1907, has not been solved.

Claude Shannon, the founder of information theory, invented a way to measure 'the amount of information' in a message without defining the word 'information' itself, nor even addressing the question of the meaning of the message.