We could try writing letters, one of us said to the other after our cross-country trip was over and we weren't done talking. Talking about hurricanes, fires, floods, droughts, freezes. About shootings, bombings, border crises, #MeToo. Jewishness, whiteness, feminism. Fear, ambition, desire. Work, marriage, friendship. Grief, anger, illness, and suicide. At once anecdotal, philosophical, political, and deeply personal, the letters quickly come to...