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All of reality is interaction.

This everyday truth is as scientific as it is philosophical and political,

and it unfolds with unexpected nuance in Carlo Revelli's science.

He's the author of the global bestseller Seven Brief Lessons on Physics.

This tiny book, in my mind, is the science writing equivalent of moving from prose to poetry.

Now he has a new book called The Order of Time.

Carlo Revelli takes up vast ideas beyond most of our imagining,

like quanta, grains of space, and time and the heat of black holes.

Seeing the world through this physicist's eyes, there is no such thing as here or now.

Our senses convey a picture of reality that narrows our understanding of its fullness.

This is also true, he says, of the huge wave of happenings, which is a human self.

A thing is something which remains equal to itself.

A stone is a thing, because I can ask where the stone is tomorrow.

What's happening is something that is limited in space and time.

A kiss is not a thing, because I cannot ask where is a kiss tomorrow.

Where is this kiss tomorrow? I mean, it just happened now.

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