It's like nuclear weapons. Ask any nuclear physicist and they'll tell you in great detail (I mean really great detail, lots and lots and lots of detail, using c

It's like nuclear weapons. Ask any nuclear physicist and they'll tell you in great detail (I mean really great detail, lots and lots and lots of detail, using common everyday phrases like "perfectly ordinary sodium iodide gamma ray spectrometer" - that really happened) how to build your own fission bomb. After that it's just a small matter of engineering.