The US government has uploaded 62 newly declassified nuclear-explosion videos to YouTube. The footage is a small share of the 10,000 Cold War-era films that archivists and physicists are trying to ...

Nuclear fallout from a bomb is less dangerous long-term than from a nuclear power plant disaster. Fallout raining from the sky is just one way people are exposed — food is another common culprit. 1.

As a comparison, "Little Boy"—the nuclear bomb that the United States dropped on Hiroshima during WWII—had a blast yield of around 15 kilotons of TNT, which is around 3,300 times less powerful.

Federal officials and agencies that work closely on the nuclear weapons arsenal agree: The threat of nuclear conflict is rising and, with it, the risk of an attack on the U.S. In a sense, U.S ...