>
>Of course, once you have the necessary HEU, making the bomb becomes
>a fairly simple exercise in well-understood physics.
>
>I would refer the interested to the Federation of American Scientists
>webpage:  www.fas.org.  On the right hand side is a heading titled
>"Resources".  More info than you ever wanted on methods of bomb
>making and all other "WMD".  Very fascinating stuff, if at times a bit
>more scientific and dry than one might prefer.

In africa, there are several sites where at one time in the past, there was
a natural reactor running.
Natural concentration of uranium reached criticality.

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