Now, now, Ard the wrath of McGrath may be on you:

Spelling of names.

Don Firth,
your argument that the Rosenbergs were hanged for something a little boy could understand is wrong. The description you have read as a little boy starts with the assumption you have a subcritical mass of fissionable material. What comes then is fairly easy. How to produce fissionable material out of raw uranium was the difficult bit you have not been told about in the magazine.

Wolfgang