“How flimsy our existence is, how many conditions must exist and must continue to exist over the course of millions of years so that a single flower or a single pencil or a single book might exist... For a moment I felt like a string being strummed by thousands of fingers, and I closed my eyes. Our existence on this planet hangs by a thread, every tomato and every onion is such an enormous miracle you could collapse with awe in a vegetable market.”