Every explanation of time requires a specific definition of time.

[T]he atoms or elementary particles themselves are not real; they form a world of potentialities or possibilities rather than one of things or facts.

Today's pricey tech is tomorrow's ubiquitous toy

War is Easy, Peace is Hard. It requires Wisdom, Patience, and Cooperation.

But now isn’t simply now. Now is also a cold reminder: one whole day later than yesterday, one year later than last year. Every now is labeled with its date, rendering all past nows obsolete, until — later of sooner — perhaps — no, not perhaps — quite certainly: it will come.

If the business of physics is ever finished, the world will be a much less interesting place in which to live . . .