The so-called Demon Core was a cursed object, a 6.2 kilogram mass of plutonium intended to be installed in a nuclear weapon. Instead, slapdash experimental techniques saw it feature in several ...

In 1946, a P-239 plutonium core scheduled for detonation ... This is the true story of the Demon Core.

The Fat Man atomic bomb was dropped over Nagasaki on August 9, 1945. Built with a solid plutonium core, Fat Man was the second (following Little Boy that was dropped at Hiroshima on August 6 ...