It was billed as a talk on Pakistan’s nuclear daddy and his propensity to spawn nuclear babies in families Americans don’t approve of. The title clearly said "Pakistan and proliferation" and the speaker was an insider, someone who had seen the gestation of the problem as a senior doctor on the job. The hall was packed with eager students, reporters, former and serving US officials and academics. Anticipation was high -- A.Q. Khan has been topic A in Washington for a month ever since the world learned of his hyper activity.