ALBUQUERQUE, N.M. — Transported in the backseat of a blacked-out Plymouth sedan was the culmination of years of feverish work — a hefty plutonium core that would soon be used to trigger the world’s ...

From 1942 to 1945, the Manhattan Project had operated in secret to develop a weapon more fearsome than anything the world had ever seen. Now, in mid-July, they were ready — or at least, they hoped so.

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.

Three weeks after North Korea conducted its first atomic explosion, a diplomatic surprise today announced by the US and China. North Korea will rejoin the six-nation talks on nuclear disarmament.

The mushroom cloud from the first atomic explosion at the Trinity Test Site on July 16, 1945, near Alamagordo, N.M. This Friday is the International Day for the Total Elimination of Nuclear Weapons — ...