Perhaps related to the nuclear test ban treaty [1], which is not in force? There was a partial test ban treaty [2] in the 60s. I'm not informed at all about n

Perhaps related to the nuclear test ban treaty [1], which is not in force? There was a partial test ban treaty [2] in the 60s. I'm not informed at all about nuclear politics, but perhaps some combination of better physics knowledge and/or better computer modeling helping remove the need for detonation to test designs and better knowledge of the effect of fallout made countries slow or stop? [1] http://en.wikipedia.org/wiki/Comprehensive_Nuclear-Test-Ban_Treaty http://en.wikipedia.org/wiki/Comprehensive_Nuclear-Test-Ban_... [2] http://en.wikipedia.org/wiki/Partial_Nuclear_Test_Ban_Treaty http://en.wikipedia.org/wiki/Partial_Nuclear_Test_Ban_Treaty Edit: it would be fascinating, since I can't seem to google the info, if there is an expert here who could share a rough timeline of the state of the art of nuclear explosion modeling