Ex-intel, atomic chiefs: Why are there so many Iran nuke estimates?

Former IDF intelligence chief Amos Yadlin and former Israel Atomic Energy Official Ephraim Asculai explain why there are so many estimates for the Iran nuke breakout timeline. https://www.jpost.com/middle-east/iran-news/ex-intel-atomic-chiefs-why-are-there-so-many-iran-nuke-estimates-655139