Seventy-four years ago this week, the U.S. dropped nuclear bombs on Hiroshima and Nagasaki. It was one of the most horrific acts of warfare in history.This month, we remember the 200,000 or more civilian men, women, and children who died, and the many thousands more...

Right now, Donald Trump could start a nuclear war on a whim, and no one could stop him.Under any circumstances, the prospect of nuclear war is terrifying, the deadly consequences irreversible. Yet with a single order, the president – any president – could...