Time," said George, "why I can give you a definition of time. It's what keeps everything from happening at once."
A ripple of laughter went about the little group of men.
"Quite so," agreed the Chemist. "And, gentlemen, that's not nearly so funny as it sounds. As a matter of fact, it is really not a bad scientific definition. Time and space are all that separate one event from another. Everything happens somewhere at sometime."
In other words, motion is the simultaneous change of the position of matter in time and space. You see how impossible it is to speak of one factor without involving the others? That is the mental attitude into which I'm trying to get you. I want you to think of time exactly as you think of length, breadth and thickness—as one of the properties of space. Isn't that clear?
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