Albert Einstein is said to have thought that God does not play dice with the universe. Two nations, Russia and the United States, now possess about 90 percent of the world’s inventory of nuclear warheads and have the godlike power to destroy most of humanity and all it has built. Yet we are not gods, but flawed human beings. In a very real sense, the presidents of Russia and the United States are stewards for all humanity: They have a duty to act responsibly in current arms-control negotiations. “Get on with it” must be humanity’s instruction to them.
