It is a human tendency to think we can solve a metaphysical mystery by putting a name to it or giving it a definition. There is no one out there, at least no one of whom I am aware, who understands gravity. Likewise, I do not know any scientist who has yet answered the oldest, most perplexing philosophical and scientific question: “What is motion?” Putting a label on something or attaching a technical term to it does not explain everything about it.

