The 80th anniversary of the atomic bombing of Hiroshima and Nagasaki is this week. It was the only time nuclear warheads were used during war. Here’s a look at the history and current U.S. stockpile.

Outside the venue, attendees spoke with those who experienced the massive U.S. bombing of Tokyo in March 1945.

Eighty years later, the “AI model” is the newest secret. This algorithm, unlike a bomb, cannot be contained within physical ...