The Demon Core - Nuclear Stability and Critical Mass

Now a days we see exponential growth everywhere. One of my favorite stories I've learned about exponential growth is the story of the Demon Core. A nuclear warhead which managed to kill negligent scientists without ever being detonated. But why did the Demon Core exist in the first place?

Sources:
https://www.sjsu.edu/faculty/watkins/nucleus.htm
https://www.sjsu.edu/faculty/watkins/NNPP.htm
https://www.sjsu.edu/faculty/watkins/spinpairexcl.htm
https://www.sjsu.edu/faculty/watkins/spinmagnets.htm

Видео The Demon Core - Nuclear Stability and Critical Mass канала But Why?