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“We don’t understand the world as made by stones — by things. We understand the world made by kisses, or things like kisses: happenings. Carlo Rovelli offers vast, complex ideas beyond most of our imagining — “quanta,” “grains of space,” “time and the heat of black holes” — and condenses them into spare, beautiful words that render them newly explicable and moving. He is the scientist behind the global bestseller “Seven Brief Lessons on Physics,” and for him, all of reality is interaction — an everyday truth as scientific as it is philosophical and political. His physicist’s way of seeing the world helps make sense of what he calls “the huge wave of happenings” that is the human self. This interview is edited and produced with music and other features in the On Being episode “Carlo Rovelli — All Reality is Interaction.” Find more at onbeing.org.