<i>"... In the six decades since Oppenheimer’s warning, the nuclear club has grown to only nine members. What accounts for the slow spread? Can anything be done to reduce it further? Is there a chance for an atomic future that is brighter than the one Oppenheimer foresaw? ..."</i><p>One way is to remove, restrict study in certain areas of Physics ~ <a href="http://www.cddc.vt.edu/host/atomic/nuketech/index.html" rel="nofollow">http://www.cddc.vt.edu/host/atomic/nuketech/index.html</a>
I found this interesting because it shows how hard it is to keep a secret when many people need to know it, and those on the outside are willing to do anything to find out.