the unease of knowing how quickly your circumstances could change on you—that no matter how carefully you shape your life into what you want it to be, the whole thing could be overturned in an instant, with little more than a single word, a single step, a phone call out of the blue, and by the end of next week you might already be looking back on this morning as if it were a million years ago, a poignant last hurrah of normal life.